fix!: fixed handling of additionalProperties to handle the bool/json-schema nature better

datamodel/high/base/schema.go

@@ -63,7 +63,7 @@ type Schema struct {
 
 	// in 3.1 UnevaluatedProperties can be a Schema or a boolean
 	// https://github.com/pb33f/libopenapi/issues/118
-	UnevaluatedProperties *DynamicValue[*SchemaProxy, *bool] `json:"unevaluatedProperties,omitempty" yaml:"unevaluatedProperties,omitempty"`
+	UnevaluatedProperties *DynamicValue[*SchemaProxy, bool] `json:"unevaluatedProperties,omitempty" yaml:"unevaluatedProperties,omitempty"`
 
 	// in 3.1 Items can be a Schema or a boolean
 	Items *DynamicValue[*SchemaProxy, bool] `json:"items,omitempty" yaml:"items,omitempty"`
@@ -89,7 +89,7 @@ type Schema struct {
 	MinProperties        *int64                            `json:"minProperties,omitempty" yaml:"minProperties,omitempty"`
 	Required             []string                          `json:"required,omitempty" yaml:"required,omitempty"`
 	Enum                 []any                             `json:"enum,omitempty" yaml:"enum,omitempty"`
-	AdditionalProperties any                     `json:"additionalProperties,omitempty" yaml:"additionalProperties,renderZero,omitempty"`
+	AdditionalProperties *DynamicValue[*SchemaProxy, bool] `json:"additionalProperties,omitempty" yaml:"additionalProperties,renderZero,omitempty"`
 	Description          string                            `json:"description,omitempty" yaml:"description,omitempty"`
 	Default              any                               `json:"default,omitempty" yaml:"default,renderZero,omitempty"`
 	Const                any                               `json:"const,omitempty" yaml:"const,renderZero,omitempty"`
@@ -211,29 +211,22 @@ func NewSchema(schema *base.Schema) *Schema {
 			Value:     schema.UnevaluatedItems.Value,
 		})
 	}
-	// check if unevaluated properties is a schema
+
-	if !schema.UnevaluatedProperties.IsEmpty() && schema.UnevaluatedProperties.Value.IsA() {
+	var unevaluatedProperties *DynamicValue[*SchemaProxy, bool]
-		s.UnevaluatedProperties = &DynamicValue[*SchemaProxy, *bool]{
+	if !schema.UnevaluatedProperties.IsEmpty() {
-			A: NewSchemaProxy(
+		if schema.UnevaluatedProperties.Value.IsA() {
-				&lowmodel.NodeReference[*base.SchemaProxy]{
+			unevaluatedProperties = &DynamicValue[*SchemaProxy, bool]{
+				A: NewSchemaProxy(&lowmodel.NodeReference[*base.SchemaProxy]{
 					ValueNode: schema.UnevaluatedProperties.ValueNode,
 					Value:     schema.UnevaluatedProperties.Value.A,
-				},
+					KeyNode:   schema.UnevaluatedProperties.KeyNode,
-			),
+				}),
-			N: 0,
+			}
+		} else {
+			unevaluatedProperties = &DynamicValue[*SchemaProxy, bool]{N: 1, B: schema.UnevaluatedProperties.Value.B}
 		}
 	}
-
+	s.UnevaluatedProperties = unevaluatedProperties
-	// check if unevaluated properties is a bool
-	if !schema.UnevaluatedProperties.IsEmpty() && schema.UnevaluatedProperties.Value.IsB() {
-		s.UnevaluatedProperties = &DynamicValue[*SchemaProxy, *bool]{
-			B: schema.UnevaluatedProperties.Value.B,
-			N: 1,
-		}
-	}
-
-	if !schema.UnevaluatedProperties.IsEmpty() {
-	}
 
 	s.Pattern = schema.Pattern.Value
 	s.Format = schema.Format.Value
@@ -248,19 +241,23 @@ func NewSchema(schema *base.Schema) *Schema {
 			s.Type = append(s.Type, schema.Type.Value.B[i].Value)
 		}
 	}
-	if schema.AdditionalProperties.Value != nil {
-		if addPropSchema, ok := schema.AdditionalProperties.Value.(*base.SchemaProxy); ok {
-			s.AdditionalProperties = NewSchemaProxy(&lowmodel.NodeReference[*base.SchemaProxy]{
-				KeyNode:   schema.AdditionalProperties.KeyNode,
-				ValueNode: schema.AdditionalProperties.ValueNode,
-				Value:     addPropSchema,
-			})
-		} else {
-			// TODO: check for slice and map types and unpack correctly.
 
-			s.AdditionalProperties = schema.AdditionalProperties.Value
+	var additionalProperties *DynamicValue[*SchemaProxy, bool]
+	if !schema.AdditionalProperties.IsEmpty() {
+		if schema.AdditionalProperties.Value.IsA() {
+			additionalProperties = &DynamicValue[*SchemaProxy, bool]{
+				A: NewSchemaProxy(&lowmodel.NodeReference[*base.SchemaProxy]{
+					ValueNode: schema.AdditionalProperties.ValueNode,
+					Value:     schema.AdditionalProperties.Value.A,
+					KeyNode:   schema.AdditionalProperties.KeyNode,
+				}),
+			}
+		} else {
+			additionalProperties = &DynamicValue[*SchemaProxy, bool]{N: 1, B: schema.AdditionalProperties.Value.B}
 		}
 	}
+	s.AdditionalProperties = additionalProperties
+
 	s.Description = schema.Description.Value
 	s.Default = schema.Default.Value
 	s.Const = schema.Const.Value
@@ -423,7 +420,8 @@ func NewSchema(schema *base.Schema) *Schema {
 					Value:     schema.Items.Value.A,
 					KeyNode:   schema.Items.KeyNode,
 				},
-				)}
+				),
+			}
 		} else {
 			items = &DynamicValue[*SchemaProxy, bool]{N: 1, B: schema.Items.Value.B}
 		}

datamodel/high/base/schema_test.go

@@ -111,7 +111,6 @@ func TestNewSchemaProxyRender(t *testing.T) {
     rice:
         $ref: '#/components/schemas/rice'`
 	assert.Equal(t, desired, strings.TrimSpace(string(rend)))
-
 }
 
 func TestNewSchemaProxy_WithObject(t *testing.T) {
@@ -217,10 +216,7 @@ properties:
         type: number
         description: a number
         example: "2"
-        additionalProperties:
+        additionalProperties: false
-            - chicken
-            - nugget
-            - soup
     somethingB:
         type: object
         exclusiveMinimum: true
@@ -241,8 +237,7 @@ properties:
                     attribute: true
                     x-pizza: love
         additionalProperties:
-            why: yes
+            type: string
-            thatIs: true
 additionalProperties: true
 required:
     - them
@@ -315,12 +310,12 @@ $anchor: anchor`
 	assert.Equal(t, "anchor", compiled.Anchor)
 
 	wentLow := compiled.GoLow()
-	assert.Equal(t, 129, wentLow.AdditionalProperties.ValueNode.Line)
+	assert.Equal(t, 125, wentLow.AdditionalProperties.ValueNode.Line)
 	assert.NotNil(t, compiled.GoLowUntyped())
 
 	// now render it out!
 	schemaBytes, _ := compiled.Render()
-	assert.Len(t, schemaBytes, 3494)
+	assert.Len(t, schemaBytes, 3417)
 }
 
 func TestSchemaObjectWithAllOfSequenceOrder(t *testing.T) {
@@ -504,7 +499,7 @@ required: [cake, fish]`
 	assert.Equal(t, float64(334), compiled.Properties["somethingB"].Schema().ExclusiveMaximum.B)
 	assert.Len(t, compiled.Properties["somethingB"].Schema().Properties["somethingBProp"].Schema().Type, 2)
 
-	assert.Equal(t, "nice", compiled.AdditionalProperties.(*SchemaProxy).Schema().Description)
+	assert.Equal(t, "nice", compiled.AdditionalProperties.A.Schema().Description)
 
 	wentLow := compiled.GoLow()
 	assert.Equal(t, 97, wentLow.AdditionalProperties.ValueNode.Line)
@@ -556,7 +551,6 @@ func TestSchemaProxy_GoLow(t *testing.T) {
 	spNil := NewSchemaProxy(nil)
 	assert.Nil(t, spNil.GoLow())
 	assert.Nil(t, spNil.GoLowUntyped())
-
 }
 
 func getHighSchema(t *testing.T, yml string) *Schema {
@@ -836,7 +830,6 @@ allOf:
 	// now render it out, it should be identical.
 	schemaBytes, _ := compiled.Render()
 	assert.Equal(t, testSpec, string(schemaBytes))
-
 }
 
 func TestNewSchemaProxy_RenderSchemaWithMultipleObjectTypes(t *testing.T) {
@@ -934,8 +927,7 @@ func TestNewSchemaProxy_RenderSchemaEnsurePropertyOrdering(t *testing.T) {
                     attribute: true
                     x-pizza: love
         additionalProperties:
-            why: yes
+            type: string
-            thatIs: true
 additionalProperties: true
 xml:
     name: XML Thing`
@@ -989,60 +981,6 @@ func TestNewSchemaProxy_RenderSchemaCheckDiscriminatorMappingOrder(t *testing.T)
 	assert.Equal(t, testSpec, strings.TrimSpace(string(schemaBytes)))
 }
 
-func TestNewSchemaProxy_RenderSchemaCheckAdditionalPropertiesSlice(t *testing.T) {
-	testSpec := `additionalProperties:
-    - one
-    - two
-    - miss a few
-    - ninety nine
-    - hundred`
-
-	var compNode yaml.Node
-	_ = yaml.Unmarshal([]byte(testSpec), &compNode)
-
-	sp := new(lowbase.SchemaProxy)
-	err := sp.Build(nil, compNode.Content[0], nil)
-	assert.NoError(t, err)
-
-	lowproxy := low.NodeReference[*lowbase.SchemaProxy]{
-		Value:     sp,
-		ValueNode: compNode.Content[0],
-	}
-
-	schemaProxy := NewSchemaProxy(&lowproxy)
-	compiled := schemaProxy.Schema()
-
-	// now render it out, it should be identical.
-	schemaBytes, _ := compiled.Render()
-	assert.Len(t, schemaBytes, 91)
-}
-
-func TestNewSchemaProxy_RenderSchemaCheckAdditionalPropertiesSliceMap(t *testing.T) {
-	testSpec := `additionalProperties:
-    - nice: cake
-    - yummy: beer
-    - hot: coffee`
-
-	var compNode yaml.Node
-	_ = yaml.Unmarshal([]byte(testSpec), &compNode)
-
-	sp := new(lowbase.SchemaProxy)
-	err := sp.Build(nil, compNode.Content[0], nil)
-	assert.NoError(t, err)
-
-	lowproxy := low.NodeReference[*lowbase.SchemaProxy]{
-		Value:     sp,
-		ValueNode: compNode.Content[0],
-	}
-
-	schemaProxy := NewSchemaProxy(&lowproxy)
-	compiled := schemaProxy.Schema()
-
-	// now render it out, it should be identical.
-	schemaBytes, _ := compiled.Render()
-	assert.Len(t, schemaBytes, 75)
-}
-
 func TestNewSchemaProxy_CheckDefaultBooleanFalse(t *testing.T) {
 	testSpec := `default: false`
 
@@ -1192,8 +1130,7 @@ unevaluatedProperties: true
 `
 	highSchema := getHighSchema(t, yml)
 
-	value := true
+	assert.True(t, highSchema.UnevaluatedProperties.B)
-	assert.EqualValues(t, &value, highSchema.UnevaluatedProperties.B)
 }
 
 func TestUnevaluatedPropertiesBoolean_False(t *testing.T) {
@@ -1203,6 +1140,54 @@ unevaluatedProperties: false
 `
 	highSchema := getHighSchema(t, yml)
 
-	value := false
+	assert.False(t, highSchema.UnevaluatedProperties.B)
-	assert.EqualValues(t, &value, highSchema.UnevaluatedProperties.B)
+}
+
+func TestUnevaluatedPropertiesBoolean_Unset(t *testing.T) {
+	yml := `
+type: number
+`
+	highSchema := getHighSchema(t, yml)
+
+	assert.Nil(t, highSchema.UnevaluatedProperties)
+}
+
+func TestAdditionalProperties(t *testing.T) {
+	testSpec := `type: object
+properties:
+  additionalPropertiesSimpleSchema:
+    type: object
+    additionalProperties:
+      type: string
+  additionalPropertiesBool:
+    type: object
+    additionalProperties: true
+  additionalPropertiesAnyOf:
+    type: object
+    additionalProperties:
+      anyOf:
+        - type: string
+        - type: array
+          items:
+            type: string
+`
+
+	var compNode yaml.Node
+	_ = yaml.Unmarshal([]byte(testSpec), &compNode)
+
+	sp := new(lowbase.SchemaProxy)
+	err := sp.Build(nil, compNode.Content[0], nil)
+	assert.NoError(t, err)
+
+	lowproxy := low.NodeReference[*lowbase.SchemaProxy]{
+		Value:     sp,
+		ValueNode: compNode.Content[0],
+	}
+
+	schemaProxy := NewSchemaProxy(&lowproxy)
+	compiled := schemaProxy.Schema()
+
+	assert.Equal(t, []string{"string"}, compiled.Properties["additionalPropertiesSimpleSchema"].Schema().AdditionalProperties.A.Schema().Type)
+	assert.Equal(t, true, compiled.Properties["additionalPropertiesBool"].Schema().AdditionalProperties.B)
+	assert.Equal(t, []string{"string"}, compiled.Properties["additionalPropertiesAnyOf"].Schema().AdditionalProperties.A.Schema().AnyOf[0].Schema().Type)
 }

datamodel/high/v3/document_test.go

@@ -220,7 +220,7 @@ func TestNewDocument_Components_Schemas(t *testing.T) {
 
 	d := h.Components.Schemas["Drink"]
 	assert.Len(t, d.Schema().Required, 2)
-	assert.True(t, d.Schema().AdditionalProperties.(bool))
+	assert.True(t, d.Schema().AdditionalProperties.B)
 	assert.Equal(t, "drinkType", d.Schema().Discriminator.PropertyName)
 	assert.Equal(t, "some value", d.Schema().Discriminator.Mapping["drink"])
 	assert.Equal(t, 516, d.Schema().Discriminator.GoLow().PropertyName.ValueNode.Line)
@@ -377,7 +377,6 @@ func testBurgerShop(t *testing.T, h *Document, checkLines bool) {
 		assert.Equal(t, 310, okResp.Links["LocateBurger"].GoLow().OperationId.ValueNode.Line)
 		assert.Equal(t, 118, burgersOp.Post.Security[0].GoLow().Requirements.ValueNode.Line)
 	}
-
 }
 
 func TestStripeAsDoc(t *testing.T) {
@@ -435,7 +434,6 @@ func TestDigitalOceanAsDocFromSHA(t *testing.T) {
 	d := NewDocument(lowDoc)
 	assert.NotNil(t, d)
 	assert.Equal(t, 183, len(d.Paths.PathItems))
-
 }
 
 func TestPetstoreAsDoc(t *testing.T) {
@@ -463,7 +461,6 @@ func TestCircularReferencesDoc(t *testing.T) {
 }
 
 func TestDocument_MarshalYAML(t *testing.T) {
-
 	// create a new document
 	initTest()
 	h := NewDocument(lowDoc)
@@ -477,11 +474,9 @@ func TestDocument_MarshalYAML(t *testing.T) {
 
 	highDoc := NewDocument(lDoc)
 	testBurgerShop(t, highDoc, false)
-
 }
 
 func TestDocument_MarshalIndention(t *testing.T) {
-
 	data, _ := os.ReadFile("../../../test_specs/single-definition.yaml")
 	info, _ := datamodel.ExtractSpecInfo(data)
 
@@ -495,11 +490,9 @@ func TestDocument_MarshalIndention(t *testing.T) {
 	rendered = highDoc.RenderWithIndention(4)
 
 	assert.NotEqual(t, string(data), strings.TrimSpace(string(rendered)))
-
 }
 
 func TestDocument_MarshalIndention_Error(t *testing.T) {
-
 	data, _ := os.ReadFile("../../../test_specs/single-definition.yaml")
 	info, _ := datamodel.ExtractSpecInfo(data)
 
@@ -513,11 +506,9 @@ func TestDocument_MarshalIndention_Error(t *testing.T) {
 	rendered = highDoc.RenderWithIndention(4)
 
 	assert.NotEqual(t, string(data), strings.TrimSpace(string(rendered)))
-
 }
 
 func TestDocument_MarshalJSON(t *testing.T) {
-
 	data, _ := os.ReadFile("../../../test_specs/petstorev3.json")
 	info, _ := datamodel.ExtractSpecInfo(data)
 
@@ -537,7 +528,6 @@ func TestDocument_MarshalJSON(t *testing.T) {
 }
 
 func TestDocument_MarshalYAMLInline(t *testing.T) {
-
 	// create a new document
 	initTest()
 	h := NewDocument(lowDoc)
@@ -551,11 +541,9 @@ func TestDocument_MarshalYAMLInline(t *testing.T) {
 
 	highDoc := NewDocument(lDoc)
 	testBurgerShop(t, highDoc, false)
-
 }
 
 func TestDocument_MarshalYAML_TestRefs(t *testing.T) {
-
 	// create a new document
 	yml := `openapi: 3.1.0
 paths:
@@ -633,7 +621,6 @@ components:
 }
 
 func TestDocument_MarshalYAML_TestParamRefs(t *testing.T) {
-
 	// create a new document
 	yml := `openapi: 3.1.0
 paths:
@@ -686,7 +673,6 @@ components:
 }
 
 func TestDocument_MarshalYAML_TestModifySchemas(t *testing.T) {
-
 	// create a new document
 	yml := `openapi: 3.1.0
 components:

datamodel/low/base/schema.go

@@ -3,7 +3,6 @@ package base
 import (
 	"crypto/sha256"
 	"fmt"
-	"reflect"
 	"sort"
 	"strconv"
 	"strings"
@@ -100,7 +99,7 @@ type Schema struct {
 	PatternProperties     low.NodeReference[map[low.KeyReference[string]]low.ValueReference[*SchemaProxy]]
 	PropertyNames         low.NodeReference[*SchemaProxy]
 	UnevaluatedItems      low.NodeReference[*SchemaProxy]
-	UnevaluatedProperties low.NodeReference[*SchemaDynamicValue[*SchemaProxy, *bool]]
+	UnevaluatedProperties low.NodeReference[*SchemaDynamicValue[*SchemaProxy, bool]]
 	Anchor                low.NodeReference[string]
 
 	// Compatible with all versions
@@ -121,7 +120,7 @@ type Schema struct {
 	Enum                 low.NodeReference[[]low.ValueReference[any]]
 	Not                  low.NodeReference[*SchemaProxy]
 	Properties           low.NodeReference[map[low.KeyReference[string]]low.ValueReference[*SchemaProxy]]
-	AdditionalProperties low.NodeReference[any]
+	AdditionalProperties low.NodeReference[*SchemaDynamicValue[*SchemaProxy, bool]]
 	Description          low.NodeReference[string]
 	ContentEncoding      low.NodeReference[string]
 	ContentMediaType     low.NodeReference[string]
@@ -189,54 +188,8 @@ func (s *Schema) Hash() [32]byte {
 		d = append(d, fmt.Sprint(s.MinProperties.Value))
 	}
 	if !s.AdditionalProperties.IsEmpty() {
-
-		// check type of properties, if we have a low level map, we need to hash the values in a repeatable
-		// order.
-		to := reflect.TypeOf(s.AdditionalProperties.Value)
-		vo := reflect.ValueOf(s.AdditionalProperties.Value)
-		var values []string
-		switch to.Kind() {
-		case reflect.Slice:
-			for i := 0; i < vo.Len(); i++ {
-				vn := vo.Index(i).Interface()
-
-				if jh, ok := vn.(low.HasValueUnTyped); ok {
-					vn = jh.GetValueUntyped()
-					fg := reflect.TypeOf(vn)
-					gf := reflect.ValueOf(vn)
-
-					if fg.Kind() == reflect.Map {
-						for _, ky := range gf.MapKeys() {
-							hu := ky.Interface()
-							values = append(values, fmt.Sprintf("%s:%s", hu, low.GenerateHashString(gf.MapIndex(ky).Interface())))
-						}
-						continue
-					}
-					values = append(values, fmt.Sprintf("%d:%s", i, low.GenerateHashString(vn)))
-				}
-			}
-			sort.Strings(values)
-			d = append(d, strings.Join(values, "||"))
-
-		case reflect.Map:
-			for _, k := range vo.MapKeys() {
-				var x string
-				var l int
-				var v any
-				// extract key
-				if o, ok := k.Interface().(low.HasKeyNode); ok {
-					x = o.GetKeyNode().Value
-					l = o.GetKeyNode().Line
-					v = vo.MapIndex(k).Interface().(low.HasValueNodeUntyped).GetValueNode().Value
-				}
-				values = append(values, fmt.Sprintf("%d:%s:%s", l, x, low.GenerateHashString(v)))
-			}
-			sort.Strings(values)
-			d = append(d, strings.Join(values, "||"))
-		default:
 		d = append(d, low.GenerateHashString(s.AdditionalProperties.Value))
 	}
-	}
 	if !s.Description.IsEmpty() {
 		d = append(d, fmt.Sprint(s.Description.Value))
 	}
@@ -667,77 +620,24 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 		}
 	}
 
-	_, addPLabel, addPNode := utils.FindKeyNodeFullTop(AdditionalPropertiesLabel, root.Content)
+	// check additionalProperties type for schema or bool
-	if addPNode != nil {
+	addPropsIsBool := false
-		if utils.IsNodeMap(addPNode) || utils.IsNodeArray(addPNode) {
+	addPropsBoolValue := true
-			// check if this is a reference, or an inline schema.
+	_, addPLabel, addPValue := utils.FindKeyNodeFullTop(AdditionalPropertiesLabel, root.Content)
-			isRef, _, _ := utils.IsNodeRefValue(addPNode)
+	if addPValue != nil {
-			var sp *SchemaProxy
+		if utils.IsNodeBoolValue(addPValue) {
-			// now check if this object has a 'type' if so, it's a schema, if not... it's a random
+			addPropsIsBool = true
-			// object, and we should treat it as a raw map.
+			addPropsBoolValue, _ = strconv.ParseBool(addPValue.Value)
-			if _, v := utils.FindKeyNodeTop(TypeLabel, addPNode.Content); v != nil {
-				sp = &SchemaProxy{
-					kn:  addPLabel,
-					vn:  addPNode,
-					idx: idx,
 		}
 	}
-			if isRef {
+	if addPropsIsBool {
-				_, vn := utils.FindKeyNodeTop("$ref", addPNode.Content)
+		s.AdditionalProperties = low.NodeReference[*SchemaDynamicValue[*SchemaProxy, bool]]{
-				sp = &SchemaProxy{
+			Value: &SchemaDynamicValue[*SchemaProxy, bool]{
-					kn:              addPLabel,
+				B: addPropsBoolValue,
-					vn:              addPNode,
+				N: 1,
-					idx:             idx,
+			},
-					isReference:     true,
+			KeyNode:   addPLabel,
-					referenceLookup: vn.Value,
+			ValueNode: addPValue,
-				}
-			}
-
-			// if this is a reference, or a schema, we're done.
-			if sp != nil {
-				s.AdditionalProperties = low.NodeReference[any]{Value: sp, KeyNode: addPLabel, ValueNode: addPNode}
-			} else {
-
-				// if this is a map, collect all the keys and values.
-				if utils.IsNodeMap(addPNode) {
-
-					addProps := make(map[low.KeyReference[string]]low.ValueReference[any])
-					var label string
-					for g := range addPNode.Content {
-						if g%2 == 0 {
-							label = addPNode.Content[g].Value
-							continue
-						} else {
-							addProps[low.KeyReference[string]{Value: label, KeyNode: addPNode.Content[g-1]}] = low.ValueReference[any]{Value: addPNode.Content[g].Value, ValueNode: addPNode.Content[g]}
-						}
-					}
-					s.AdditionalProperties = low.NodeReference[any]{Value: addProps, KeyNode: addPLabel, ValueNode: addPNode}
-				}
-
-				// if the node is an array, extract everything into a trackable structure
-				if utils.IsNodeArray(addPNode) {
-					var addProps []low.ValueReference[any]
-
-					// if this is an array or maps, encode the map items correctly.
-					for i := range addPNode.Content {
-						if utils.IsNodeMap(addPNode.Content[i]) {
-							var prop map[string]any
-							_ = addPNode.Content[i].Decode(&prop)
-							addProps = append(addProps,
-								low.ValueReference[any]{Value: prop, ValueNode: addPNode.Content[i]})
-						} else {
-							addProps = append(addProps,
-								low.ValueReference[any]{Value: addPNode.Content[i].Value, ValueNode: addPNode.Content[i]})
-						}
-					}
-
-					s.AdditionalProperties = low.NodeReference[any]{Value: addProps, KeyNode: addPLabel, ValueNode: addPNode}
-				}
-			}
-		}
-		if utils.IsNodeBoolValue(addPNode) {
-			b, _ := strconv.ParseBool(addPNode.Value)
-			s.AdditionalProperties = low.NodeReference[any]{Value: b, KeyNode: addPLabel, ValueNode: addPNode}
 		}
 	}
 
@@ -827,9 +727,9 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 		}
 	}
 	if unevalIsBool {
-		s.UnevaluatedProperties = low.NodeReference[*SchemaDynamicValue[*SchemaProxy, *bool]]{
+		s.UnevaluatedProperties = low.NodeReference[*SchemaDynamicValue[*SchemaProxy, bool]]{
-			Value: &SchemaDynamicValue[*SchemaProxy, *bool]{
+			Value: &SchemaDynamicValue[*SchemaProxy, bool]{
-				B: &unevalBoolValue,
+				B: unevalBoolValue,
 				N: 1,
 			},
 			KeyNode:   unevalLabel,
@@ -838,7 +738,7 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 	}
 
 	var allOf, anyOf, oneOf, prefixItems []low.ValueReference[*SchemaProxy]
-	var items, not, contains, sif, selse, sthen, propertyNames, unevalItems, unevalProperties low.ValueReference[*SchemaProxy]
+	var items, not, contains, sif, selse, sthen, propertyNames, unevalItems, unevalProperties, addProperties low.ValueReference[*SchemaProxy]
 
 	_, allOfLabel, allOfValue := utils.FindKeyNodeFullTop(AllOfLabel, root.Content)
 	_, anyOfLabel, anyOfValue := utils.FindKeyNodeFullTop(AnyOfLabel, root.Content)
@@ -852,6 +752,7 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 	_, propNamesLabel, propNamesValue := utils.FindKeyNodeFullTop(PropertyNamesLabel, root.Content)
 	_, unevalItemsLabel, unevalItemsValue := utils.FindKeyNodeFullTop(UnevaluatedItemsLabel, root.Content)
 	_, unevalPropsLabel, unevalPropsValue := utils.FindKeyNodeFullTop(UnevaluatedPropertiesLabel, root.Content)
+	_, addPropsLabel, addPropsValue := utils.FindKeyNodeFullTop(AdditionalPropertiesLabel, root.Content)
 
 	errorChan := make(chan error)
 	allOfChan := make(chan schemaProxyBuildResult)
@@ -867,6 +768,7 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 	propNamesChan := make(chan schemaProxyBuildResult)
 	unevalItemsChan := make(chan schemaProxyBuildResult)
 	unevalPropsChan := make(chan schemaProxyBuildResult)
+	addPropsChan := make(chan schemaProxyBuildResult)
 
 	totalBuilds := countSubSchemaItems(allOfValue) +
 		countSubSchemaItems(anyOfValue) +
@@ -921,6 +823,10 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 		totalBuilds++
 		go buildSchema(unevalPropsChan, unevalPropsLabel, unevalPropsValue, errorChan, idx)
 	}
+	if !addPropsIsBool && addPropsValue != nil {
+		totalBuilds++
+		go buildSchema(addPropsChan, addPropsLabel, addPropsValue, errorChan, idx)
+	}
 
 	completeCount := 0
 	for completeCount < totalBuilds {
@@ -966,6 +872,9 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 		case r := <-unevalPropsChan:
 			completeCount++
 			unevalProperties = r.v
+		case r := <-addPropsChan:
+			completeCount++
+			addProperties = r.v
 		}
 	}
 
@@ -1056,14 +965,23 @@ func (s *Schema) Build(root *yaml.Node, idx *index.SpecIndex) error {
 		}
 	}
 	if !unevalIsBool && !unevalProperties.IsEmpty() {
-		s.UnevaluatedProperties = low.NodeReference[*SchemaDynamicValue[*SchemaProxy, *bool]]{
+		s.UnevaluatedProperties = low.NodeReference[*SchemaDynamicValue[*SchemaProxy, bool]]{
-			Value: &SchemaDynamicValue[*SchemaProxy, *bool]{
+			Value: &SchemaDynamicValue[*SchemaProxy, bool]{
 				A: unevalProperties.Value,
 			},
 			KeyNode:   unevalPropsLabel,
 			ValueNode: unevalPropsValue,
 		}
 	}
+	if !addPropsIsBool && !addProperties.IsEmpty() {
+		s.AdditionalProperties = low.NodeReference[*SchemaDynamicValue[*SchemaProxy, bool]]{
+			Value: &SchemaDynamicValue[*SchemaProxy, bool]{
+				A: addProperties.Value,
+			},
+			KeyNode:   addPropsLabel,
+			ValueNode: addPropsValue,
+		}
+	}
 	return nil
 }
 
@@ -1219,8 +1137,7 @@ func buildSchema(schemas chan schemaProxyBuildResult, labelNode, valueNode *yaml
 					v: *r.res,
 				}
 			}
-		}
+		} else if utils.IsNodeArray(valueNode) {
-		if utils.IsNodeArray(valueNode) {
 			refBuilds := 0
 			results := make([]*low.ValueReference[*SchemaProxy], len(valueNode.Content))
 
@@ -1261,6 +1178,8 @@ func buildSchema(schemas chan schemaProxyBuildResult, labelNode, valueNode *yaml
 					v: *r,
 				}
 			}
+		} else {
+			errors <- fmt.Errorf("build schema failed: unexpected node type: %s, line %d, col %d", valueNode.Tag, valueNode.Line, valueNode.Column)
 		}
 	}
 }

datamodel/low/base/schema_test.go

@@ -169,7 +169,7 @@ func Test_Schema(t *testing.T) {
 	schErr := sch.Build(rootNode.Content[0], nil)
 	assert.NoError(t, schErr)
 	assert.Equal(t, "something object", sch.Description.Value)
-	assert.True(t, sch.AdditionalProperties.Value.(bool))
+	assert.True(t, sch.AdditionalProperties.Value.B)
 
 	assert.Len(t, sch.Properties.Value, 2)
 	v := sch.FindProperty("somethingB")
@@ -1172,30 +1172,7 @@ func TestExtractSchema_AdditionalPropertiesAsSchema(t *testing.T) {
 
 	res, err := ExtractSchema(idxNode.Content[0], idx)
 
-	assert.NotNil(t, res.Value.Schema().AdditionalProperties.Value.(*SchemaProxy).Schema())
+	assert.NotNil(t, res.Value.Schema().AdditionalProperties.Value.A.Schema())
-	assert.Nil(t, err)
-}
-
-func TestExtractSchema_AdditionalPropertiesAsSchemaSlice(t *testing.T) {
-	yml := `components:
-  schemas:
-    Something:
-      additionalProperties:
-        - nice: rice`
-
-	var iNode yaml.Node
-	mErr := yaml.Unmarshal([]byte(yml), &iNode)
-	assert.NoError(t, mErr)
-	idx := index.NewSpecIndex(&iNode)
-
-	yml = `$ref: '#/components/schemas/Something'`
-
-	var idxNode yaml.Node
-	_ = yaml.Unmarshal([]byte(yml), &idxNode)
-
-	res, err := ExtractSchema(idxNode.Content[0], idx)
-
-	assert.NotNil(t, res.Value.Schema().AdditionalProperties.Value.([]low.ValueReference[interface{}]))
 	assert.Nil(t, err)
 }
 
@@ -1244,7 +1221,7 @@ func TestExtractSchema_AdditionalProperties_Ref(t *testing.T) {
 	_ = yaml.Unmarshal([]byte(yml), &idxNode)
 
 	res, err := ExtractSchema(idxNode.Content[0], idx)
-	assert.NotNil(t, res.Value.Schema().AdditionalProperties.Value.(*SchemaProxy).Schema())
+	assert.NotNil(t, res.Value.Schema().AdditionalProperties.Value.A.Schema())
 	assert.Nil(t, err)
 }
 
@@ -1378,7 +1355,7 @@ func TestSchema_Hash_Equal(t *testing.T) {
   uniqueItems: 1
   maxProperties: 10
   minProperties: 1
-  additionalProperties: anything
+  additionalProperties: true
   description: milky
   contentEncoding: rubber shoes
   contentMediaType: paper tiger
@@ -1420,7 +1397,7 @@ func TestSchema_Hash_Equal(t *testing.T) {
   uniqueItems: 1
   maxProperties: 10
   minProperties: 1
-  additionalProperties: anything
+  additionalProperties: true
   description: milky
   contentEncoding: rubber shoes
   contentMediaType: paper tiger
@@ -1611,7 +1588,7 @@ func TestSchema_UnevaluatedPropertiesAsBool_DefinedAsTrue(t *testing.T) {
 	res, _ := ExtractSchema(idxNode.Content[0], idx)
 
 	assert.True(t, res.Value.Schema().UnevaluatedProperties.Value.IsB())
-	assert.True(t, *res.Value.Schema().UnevaluatedProperties.Value.B)
+	assert.True(t, res.Value.Schema().UnevaluatedProperties.Value.B)
 
 	assert.Equal(t, "571bd1853c22393131e2dcadce86894da714ec14968895c8b7ed18154b2be8cd",
 		low.GenerateHashString(res.Value.Schema().UnevaluatedProperties.Value))
@@ -1636,7 +1613,7 @@ func TestSchema_UnevaluatedPropertiesAsBool_DefinedAsFalse(t *testing.T) {
 	res, _ := ExtractSchema(idxNode.Content[0], idx)
 
 	assert.True(t, res.Value.Schema().UnevaluatedProperties.Value.IsB())
-	assert.False(t, *res.Value.Schema().UnevaluatedProperties.Value.B)
+	assert.False(t, res.Value.Schema().UnevaluatedProperties.Value.B)
 }
 
 func TestSchema_UnevaluatedPropertiesAsBool_Undefined(t *testing.T) {

datamodel/low/v3/create_document_test.go

@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	"github.com/pb33f/libopenapi/datamodel"
-	"github.com/pb33f/libopenapi/datamodel/low/base"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -52,7 +51,6 @@ func BenchmarkCreateDocument_Circular(b *testing.B) {
 }
 
 func BenchmarkCreateDocument_k8s(b *testing.B) {
-
 	data, _ := os.ReadFile("../../../test_specs/k8s.json")
 	info, _ := datamodel.ExtractSpecInfo(data)
 
@@ -69,7 +67,6 @@ func BenchmarkCreateDocument_k8s(b *testing.B) {
 }
 
 func TestCircularReferenceError(t *testing.T) {
-
 	data, _ := os.ReadFile("../../../test_specs/circular-tests.yaml")
 	info, _ := datamodel.ExtractSpecInfo(data)
 	circDoc, err := CreateDocumentFromConfig(info, &datamodel.DocumentConfiguration{
@@ -81,7 +78,6 @@ func TestCircularReferenceError(t *testing.T) {
 }
 
 func TestCircularReference_IgnoreArray(t *testing.T) {
-
 	spec := `openapi: 3.1.0
 components:
   schemas:
@@ -110,7 +106,6 @@ components:
 }
 
 func TestCircularReference_IgnorePoly(t *testing.T) {
-
 	spec := `openapi: 3.1.0
 components:
   schemas:
@@ -168,7 +163,6 @@ func BenchmarkCreateDocument_Petstore(b *testing.B) {
 }
 
 func TestCreateDocumentStripe(t *testing.T) {
-
 	data, _ := os.ReadFile("../../../test_specs/stripe.yaml")
 	info, _ := datamodel.ExtractSpecInfo(data)
 	d, err := CreateDocumentFromConfig(info, &datamodel.DocumentConfiguration{
@@ -303,7 +297,6 @@ func TestCreateDocument_Tags(t *testing.T) {
 			// this is why we will need a higher level API to this model, this looks cool and all, but dude.
 			assert.Equal(t, "now?", extension.Value.(map[string]interface{})["ok"].([]interface{})[0].(map[string]interface{})["what"])
 		}
-
 	}
 
 	/// tag2
@@ -313,7 +306,6 @@ func TestCreateDocument_Tags(t *testing.T) {
 	assert.Equal(t, "https://pb33f.io", doc.Tags.Value[1].Value.ExternalDocs.Value.URL.Value)
 	assert.NotEmpty(t, doc.Tags.Value[1].Value.ExternalDocs.Value.URL.Value)
 	assert.Len(t, doc.Tags.Value[1].Value.Extensions, 0)
-
 }
 
 func TestCreateDocument_Paths(t *testing.T) {
@@ -438,7 +430,6 @@ func TestCreateDocument_Paths(t *testing.T) {
 	assert.NotNil(t, servers)
 	assert.Len(t, servers, 1)
 	assert.Equal(t, "https://pb33f.io", servers[0].Value.URL.Value)
-
 }
 
 func TestCreateDocument_Components_Schemas(t *testing.T) {
@@ -464,7 +455,6 @@ func TestCreateDocument_Components_Schemas(t *testing.T) {
 	p := fries.Value.Schema().FindProperty("favoriteDrink")
 	assert.Equal(t, "a frosty cold beverage can be coke or sprite",
 		p.Value.Schema().Description.Value)
-
 }
 
 func TestCreateDocument_Components_SecuritySchemes(t *testing.T) {
@@ -493,7 +483,6 @@ func TestCreateDocument_Components_SecuritySchemes(t *testing.T) {
 	readScope = oAuth.Flows.Value.AuthorizationCode.Value.FindScope("write:burgers")
 	assert.NotNil(t, readScope)
 	assert.Equal(t, "modify burgers and stuff", readScope.Value)
-
 }
 
 func TestCreateDocument_Components_Responses(t *testing.T) {
@@ -506,7 +495,6 @@ func TestCreateDocument_Components_Responses(t *testing.T) {
 	assert.NotNil(t, dressingResponse.Value)
 	assert.Equal(t, "all the dressings for a burger.", dressingResponse.Value.Description.Value)
 	assert.Len(t, dressingResponse.Value.Content.Value, 1)
-
 }
 
 func TestCreateDocument_Components_Examples(t *testing.T) {
@@ -593,7 +581,6 @@ func TestCreateDocument_Component_Discriminator(t *testing.T) {
 	assert.Nil(t, dsc.FindMappingValue("don't exist"))
 	assert.NotNil(t, doc.GetExternalDocs())
 	assert.Nil(t, doc.FindSecurityRequirement("scooby doo"))
-
 }
 
 func TestCreateDocument_CheckAdditionalProperties_Schema(t *testing.T) {
@@ -601,11 +588,8 @@ func TestCreateDocument_CheckAdditionalProperties_Schema(t *testing.T) {
 	components := doc.Components.Value
 	d := components.FindSchema("Dressing")
 	assert.NotNil(t, d.Value.Schema().AdditionalProperties.Value)
-	if n, ok := d.Value.Schema().AdditionalProperties.Value.(*base.SchemaProxy); ok {
+
-		assert.Equal(t, "something in here.", n.Schema().Description.Value)
+	assert.True(t, d.Value.Schema().AdditionalProperties.Value.IsA(), "should be a schema")
-	} else {
-		assert.Fail(t, "should be a schema")
-	}
 }
 
 func TestCreateDocument_CheckAdditionalProperties_Bool(t *testing.T) {
@@ -613,7 +597,7 @@ func TestCreateDocument_CheckAdditionalProperties_Bool(t *testing.T) {
 	components := doc.Components.Value
 	d := components.FindSchema("Drink")
 	assert.NotNil(t, d.Value.Schema().AdditionalProperties.Value)
-	assert.True(t, d.Value.Schema().AdditionalProperties.Value.(bool))
+	assert.True(t, d.Value.Schema().AdditionalProperties.Value.B)
 }
 
 func TestCreateDocument_Components_Error(t *testing.T) {
@@ -667,7 +651,6 @@ components:
 		AllowRemoteReferences: false,
 	})
 	assert.Len(t, err, 1)
-
 }
 
 func TestCreateDocument_Paths_Errors(t *testing.T) {
@@ -776,8 +759,8 @@ func TestCreateDocument_YamlAnchor(t *testing.T) {
 	assert.NotNil(t, jsonGet)
 
 	// Should this work? It doesn't
-	//postJsonType := examplePath.GetValue().Post.GetValue().RequestBody.GetValue().FindContent("application/json")
+	// postJsonType := examplePath.GetValue().Post.GetValue().RequestBody.GetValue().FindContent("application/json")
-	//assert.NotNil(t, postJsonType)
+	// assert.NotNil(t, postJsonType)
 }
 
 func ExampleCreateDocument() {

what-changed/model/schema.go

@@ -5,14 +5,14 @@ package model
 
 import (
 	"fmt"
-	"golang.org/x/exp/slices"
 	"sort"
 	"sync"
 
+	"golang.org/x/exp/slices"
+
 	"github.com/pb33f/libopenapi/datamodel/low"
 	"github.com/pb33f/libopenapi/datamodel/low/base"
 	v3 "github.com/pb33f/libopenapi/datamodel/low/v3"
-	"github.com/pb33f/libopenapi/utils"
 	"gopkg.in/yaml.v3"
 )
 
@@ -34,6 +34,7 @@ type SchemaChanges struct {
 	ExternalDocChanges          *ExternalDocChanges       `json:"externalDoc,omitempty" yaml:"externalDoc,omitempty"`
 	XMLChanges                  *XMLChanges               `json:"xml,omitempty" yaml:"xml,omitempty"`
 	ExtensionChanges            *ExtensionChanges         `json:"extensions,omitempty" yaml:"extensions,omitempty"`
+	AdditionalPropertiesChanges *SchemaChanges            `json:"additionalProperties,omitempty" yaml:"additionalProperties,omitempty"`
 
 	// 3.1 specifics
 	IfChanges                    *SchemaChanges            `json:"if,omitempty" yaml:"if,omitempty"`
@@ -102,6 +103,9 @@ func (s *SchemaChanges) GetAllChanges() []*Change {
 	if s.UnevaluatedPropertiesChanges != nil {
 		changes = append(changes, s.UnevaluatedPropertiesChanges.GetAllChanges()...)
 	}
+	if s.AdditionalPropertiesChanges != nil {
+		changes = append(changes, s.AdditionalPropertiesChanges.GetAllChanges()...)
+	}
 	if s.SchemaPropertyChanges != nil {
 		for n := range s.SchemaPropertyChanges {
 			if s.SchemaPropertyChanges[n] != nil {
@@ -185,6 +189,9 @@ func (s *SchemaChanges) TotalChanges() int {
 	if s.UnevaluatedPropertiesChanges != nil {
 		t += s.UnevaluatedPropertiesChanges.TotalChanges()
 	}
+	if s.AdditionalPropertiesChanges != nil {
+		t += s.AdditionalPropertiesChanges.TotalChanges()
+	}
 	if s.SchemaPropertyChanges != nil {
 		for n := range s.SchemaPropertyChanges {
 			if s.SchemaPropertyChanges[n] != nil {
@@ -267,6 +274,9 @@ func (s *SchemaChanges) TotalBreakingChanges() int {
 	if s.UnevaluatedPropertiesChanges != nil {
 		t += s.UnevaluatedPropertiesChanges.TotalBreakingChanges()
 	}
+	if s.AdditionalPropertiesChanges != nil {
+		t += s.AdditionalPropertiesChanges.TotalBreakingChanges()
+	}
 	if s.DependentSchemasChanges != nil {
 		for n := range s.DependentSchemasChanges {
 			t += s.DependentSchemasChanges[n].TotalBreakingChanges()
@@ -728,18 +738,36 @@ func checkSchemaPropertyChanges(
 		New:       rSchema,
 	})
 
-	// AdditionalProperties (only if not an object)
+	// AdditionalProperties
-	if !utils.IsNodeMap(lSchema.AdditionalProperties.ValueNode) &&
+	if lSchema.AdditionalProperties.Value != nil && rSchema.AdditionalProperties.Value != nil {
-		!utils.IsNodeMap(rSchema.AdditionalProperties.ValueNode) {
+		if lSchema.AdditionalProperties.Value.IsA() && rSchema.AdditionalProperties.Value.IsA() {
-		props = append(props, &PropertyCheck{
+			if !low.AreEqual(lSchema.AdditionalProperties.Value.A, rSchema.AdditionalProperties.Value.A) {
-			LeftNode:  lSchema.AdditionalProperties.ValueNode,
+				sc.AdditionalPropertiesChanges = CompareSchemas(lSchema.AdditionalProperties.Value.A, rSchema.AdditionalProperties.Value.A)
-			RightNode: rSchema.AdditionalProperties.ValueNode,
+			}
-			Label:     v3.AdditionalPropertiesLabel,
+		} else {
-			Changes:   changes,
+			if lSchema.AdditionalProperties.Value.IsB() && rSchema.AdditionalProperties.Value.IsB() {
-			Breaking:  false,
+				if lSchema.AdditionalProperties.Value.B != rSchema.AdditionalProperties.Value.B {
-			Original:  lSchema,
+					CreateChange(changes, Modified, v3.AdditionalPropertiesLabel,
-			New:       rSchema,
+						lSchema.AdditionalProperties.ValueNode, rSchema.AdditionalProperties.ValueNode, true,
-		})
+						lSchema.AdditionalProperties.Value.B, rSchema.AdditionalProperties.Value.B)
+				}
+			} else {
+				CreateChange(changes, Modified, v3.AdditionalPropertiesLabel,
+					lSchema.AdditionalProperties.ValueNode, rSchema.AdditionalProperties.ValueNode, true,
+					lSchema.AdditionalProperties.Value.B, rSchema.AdditionalProperties.Value.B)
+			}
+		}
+	}
+
+	// added AdditionalProperties
+	if lSchema.AdditionalProperties.Value == nil && rSchema.AdditionalProperties.Value != nil {
+		CreateChange(changes, ObjectAdded, v3.AdditionalPropertiesLabel,
+			nil, rSchema.AdditionalProperties.ValueNode, true, nil, rSchema.AdditionalProperties.Value)
+	}
+	// removed AdditionalProperties
+	if lSchema.AdditionalProperties.Value != nil && rSchema.AdditionalProperties.Value == nil {
+		CreateChange(changes, ObjectRemoved, v3.AdditionalPropertiesLabel,
+			lSchema.AdditionalProperties.ValueNode, nil, true, lSchema.AdditionalProperties.Value, nil)
 	}
 
 	// Description
@@ -1108,20 +1136,6 @@ func checkSchemaPropertyChanges(
 	// check extensions
 	sc.ExtensionChanges = CompareExtensions(lSchema.Extensions, rSchema.Extensions)
 
-	// if additional properties is an object, then hash it
-	// AdditionalProperties (only if not an object)
-	if utils.IsNodeMap(lSchema.AdditionalProperties.ValueNode) ||
-		utils.IsNodeMap(rSchema.AdditionalProperties.ValueNode) {
-
-		lHash := low.GenerateHashString(lSchema.AdditionalProperties.ValueNode)
-		rHash := low.GenerateHashString(rSchema.AdditionalProperties.ValueNode)
-		if lHash != rHash {
-			CreateChange(changes, Modified, v3.AdditionalPropertiesLabel,
-				lSchema.AdditionalProperties.ValueNode, rSchema.AdditionalProperties.ValueNode, false,
-				lSchema.AdditionalProperties.Value, rSchema.AdditionalProperties.Value)
-		}
-	}
-
 	// check core properties
 	CheckProperties(props)
 }

what-changed/model/schema_test.go

@@ -5,13 +5,14 @@ package model
 
 import (
 	"fmt"
+	"testing"
+
 	"github.com/pb33f/libopenapi/datamodel"
 	"github.com/pb33f/libopenapi/datamodel/low"
 	"github.com/pb33f/libopenapi/datamodel/low/base"
 	v2 "github.com/pb33f/libopenapi/datamodel/low/v2"
 	v3 "github.com/pb33f/libopenapi/datamodel/low/v3"
 	"github.com/stretchr/testify/assert"
-	"testing"
 )
 
 // These tests require full documents to be tested properly. schemas are perhaps the most complex
@@ -158,7 +159,6 @@ components:
 }
 
 func test_BuildDoc(l, r string) (*v3.Document, *v3.Document) {
-
 	leftInfo, _ := datamodel.ExtractSpecInfo([]byte(l))
 	rightInfo, _ := datamodel.ExtractSpecInfo([]byte(r))
 
@@ -168,7 +168,6 @@ func test_BuildDoc(l, r string) (*v3.Document, *v3.Document) {
 }
 
 func test_BuildDocv2(l, r string) (*v2.Swagger, *v2.Swagger) {
-
 	leftInfo, _ := datamodel.ExtractSpecInfo([]byte(l))
 	rightInfo, _ := datamodel.ExtractSpecInfo([]byte(r))
 
@@ -278,7 +277,6 @@ components:
 	assert.Equal(t, Modified, changes.Changes[0].ChangeType)
 	assert.Equal(t, v3.RefLabel, changes.Changes[0].Property)
 	assert.Equal(t, "#/components/schemas/Yo", changes.Changes[0].Original)
-
 }
 
 func TestCompareSchemas_InlineToRef(t *testing.T) {
@@ -311,7 +309,6 @@ components:
 	assert.Equal(t, Modified, changes.Changes[0].ChangeType)
 	assert.Equal(t, v3.RefLabel, changes.Changes[0].Property)
 	assert.Equal(t, "#/components/schemas/Yo", changes.Changes[0].New)
-
 }
 
 func TestCompareSchemas_Identical(t *testing.T) {
@@ -1222,6 +1219,93 @@ components:
 	assert.Equal(t, v3.UnevaluatedPropertiesLabel, changes.Changes[0].Property)
 }
 
+func TestCompareSchemas_AdditionalProperties(t *testing.T) {
+	left := `openapi: 3.1
+components:
+  schemas:
+    OK:
+      additionalProperties:
+        type: string`
+
+	right := `openapi: 3.1
+components:
+  schemas:
+    OK:
+      additionalProperties:
+        type: int`
+
+	leftDoc, rightDoc := test_BuildDoc(left, right)
+
+	// extract left reference schema and non reference schema.
+	lSchemaProxy := leftDoc.Components.Value.FindSchema("OK").Value
+	rSchemaProxy := rightDoc.Components.Value.FindSchema("OK").Value
+
+	changes := CompareSchemas(lSchemaProxy, rSchemaProxy)
+	assert.NotNil(t, changes)
+	assert.Equal(t, 1, changes.TotalChanges())
+	assert.Len(t, changes.GetAllChanges(), 1)
+	assert.Equal(t, 1, changes.TotalBreakingChanges())
+	assert.Equal(t, 1, changes.AdditionalPropertiesChanges.PropertyChanges.TotalChanges())
+}
+
+func TestCompareSchemas_AdditionalProperties_Added(t *testing.T) {
+	left := `openapi: 3.1
+components:
+  schemas:
+    OK:
+      type: string`
+
+	right := `openapi: 3.1
+components:
+  schemas:
+    OK:
+      type: string
+      additionalProperties:
+        type: int`
+
+	leftDoc, rightDoc := test_BuildDoc(left, right)
+
+	// extract left reference schema and non reference schema.
+	lSchemaProxy := leftDoc.Components.Value.FindSchema("OK").Value
+	rSchemaProxy := rightDoc.Components.Value.FindSchema("OK").Value
+
+	changes := CompareSchemas(lSchemaProxy, rSchemaProxy)
+	assert.NotNil(t, changes)
+	assert.Equal(t, 1, changes.TotalChanges())
+	assert.Len(t, changes.GetAllChanges(), 1)
+	assert.Equal(t, 1, changes.TotalBreakingChanges())
+	assert.Equal(t, v3.AdditionalPropertiesLabel, changes.Changes[0].Property)
+}
+
+func TestCompareSchemas_AdditionalProperties_Removed(t *testing.T) {
+	left := `openapi: 3.1
+components:
+  schemas:
+    OK:
+      type: string`
+
+	right := `openapi: 3.1
+components:
+  schemas:
+    OK:
+      type: string
+      additionalProperties:
+        type: int`
+
+	leftDoc, rightDoc := test_BuildDoc(left, right)
+
+	// extract left reference schema and non reference schema.
+	lSchemaProxy := leftDoc.Components.Value.FindSchema("OK").Value
+	rSchemaProxy := rightDoc.Components.Value.FindSchema("OK").Value
+
+	changes := CompareSchemas(rSchemaProxy, lSchemaProxy)
+	assert.NotNil(t, changes)
+	assert.Equal(t, 1, changes.TotalChanges())
+	assert.Len(t, changes.GetAllChanges(), 1)
+	assert.Equal(t, 1, changes.TotalBreakingChanges())
+	assert.Equal(t, v3.AdditionalPropertiesLabel, changes.Changes[0].Property)
+}
+
 func TestCompareSchemas_UnevaluatedItems(t *testing.T) {
 	left := `openapi: 3.1
 components:
@@ -1611,7 +1695,6 @@ components:
 	assert.Equal(t, Modified, changes.AnyOfChanges[0].Changes[0].ChangeType)
 	assert.Equal(t, "string", changes.AnyOfChanges[0].Changes[0].New)
 	assert.Equal(t, "bool", changes.AnyOfChanges[0].Changes[0].Original)
-
 }
 
 func TestCompareSchemas_OneOfModifyAndAddItem(t *testing.T) {
@@ -1848,7 +1931,6 @@ components:
 	assert.Equal(t, ObjectAdded, changes.Changes[0].ChangeType)
 	assert.Equal(t, "0e563831440581c713657dd857a0ec3af1bd7308a43bd3cae9184f61d61b288f",
 		low.HashToString(changes.Changes[0].NewObject.(*base.Discriminator).Hash()))
-
 }
 
 func TestCompareSchemas_DiscriminatorRemove(t *testing.T) {
@@ -1881,7 +1963,6 @@ components:
 	assert.Equal(t, ObjectRemoved, changes.Changes[0].ChangeType)
 	assert.Equal(t, "0e563831440581c713657dd857a0ec3af1bd7308a43bd3cae9184f61d61b288f",
 		low.HashToString(changes.Changes[0].OriginalObject.(*base.Discriminator).Hash()))
-
 }
 
 func TestCompareSchemas_ExternalDocsChange(t *testing.T) {
@@ -1948,7 +2029,6 @@ components:
 	assert.Equal(t, ObjectAdded, changes.Changes[0].ChangeType)
 	assert.Equal(t, "2b7adf30f2ea3a7617ccf429a099617a9c03e8b5f3a23a89dba4b90f760010d7",
 		low.HashToString(changes.Changes[0].NewObject.(*base.ExternalDoc).Hash()))
-
 }
 
 func TestCompareSchemas_ExternalDocsRemove(t *testing.T) {
@@ -1981,7 +2061,6 @@ components:
 	assert.Equal(t, ObjectRemoved, changes.Changes[0].ChangeType)
 	assert.Equal(t, "2b7adf30f2ea3a7617ccf429a099617a9c03e8b5f3a23a89dba4b90f760010d7",
 		low.HashToString(changes.Changes[0].OriginalObject.(*base.ExternalDoc).Hash()))
-
 }
 
 func TestCompareSchemas_AddExtension(t *testing.T) {
@@ -2402,7 +2481,6 @@ components:
 	assert.Equal(t, 1, changes.TotalChanges())
 	assert.Len(t, changes.GetAllChanges(), 1)
 	assert.Equal(t, 1, changes.TotalBreakingChanges())
-
 }
 
 func TestCompareSchemas_SchemaAdditionalPropertiesCheck(t *testing.T) {
@@ -2432,7 +2510,6 @@ components:
 	assert.Equal(t, 1, changes.TotalChanges())
 	assert.Len(t, changes.GetAllChanges(), 1)
 	assert.Equal(t, 0, changes.TotalBreakingChanges())
-
 }
 
 func TestCompareSchemas_Schema_DeletePoly(t *testing.T) {
@@ -2466,7 +2543,6 @@ components:
 	assert.Equal(t, 1, changes.TotalChanges())
 	assert.Len(t, changes.GetAllChanges(), 1)
 	assert.Equal(t, 1, changes.TotalBreakingChanges())
-
 }
 
 func TestCompareSchemas_Schema_AddExamplesArray_AllOf(t *testing.T) {
@@ -2499,7 +2575,6 @@ components:
 	assert.Equal(t, 1, changes.TotalChanges())
 	assert.Len(t, changes.GetAllChanges(), 1)
 	assert.Equal(t, 0, changes.TotalBreakingChanges())
-
 }
 
 func TestCompareSchemas_Schema_AddExampleMap_AllOf(t *testing.T) {
@@ -2566,7 +2641,6 @@ components:
 	assert.Equal(t, 1, changes.TotalChanges())
 	assert.Len(t, changes.GetAllChanges(), 1)
 	assert.Equal(t, 0, changes.TotalBreakingChanges())
-
 }
 
 func TestCompareSchemas_Schema_AddExamplesMap(t *testing.T) {
@@ -2601,7 +2675,6 @@ components:
 	assert.Equal(t, 1, changes.TotalChanges())
 	assert.Len(t, changes.GetAllChanges(), 1)
 	assert.Equal(t, 0, changes.TotalBreakingChanges())
-
 }
 
 func TestCompareSchemas_Schema_AddExamples(t *testing.T) {
@@ -2661,7 +2734,6 @@ components:
 	assert.Equal(t, 1, changes.TotalChanges())
 	assert.Len(t, changes.GetAllChanges(), 1)
 	assert.Equal(t, 0, changes.TotalBreakingChanges())
-
 }
 
 func TestCompareSchemas_CheckIssue_170(t *testing.T) {