diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 68dadfa..218fd2f 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -7,9 +7,13 @@ on:
 
 jobs:
 
+  api_breakage:
+    name: Check API breakage
+    uses: BinaryBirds/github-workflows/.github/workflows/api_breakage.yml@main
+
   swiftlang_checks:
     name: Swiftlang Checks
-    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
+    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@0.0.7
     with:
       license_header_check_project_name: "project"
       format_check_enabled : true
diff --git a/Sources/FeatherOpenAPI/Schema/BoolSchemaRepresentable.swift b/Sources/FeatherOpenAPI/Schema/BoolSchemaRepresentable.swift
index d4976da..03f00eb 100644
--- a/Sources/FeatherOpenAPI/Schema/BoolSchemaRepresentable.swift
+++ b/Sources/FeatherOpenAPI/Schema/BoolSchemaRepresentable.swift
@@ -35,8 +35,8 @@ extension BoolSchemaRepresentable {
             discriminator: nil,
             externalDocs: nil,
             allowedValues: nil,
-            defaultValue: .init(defaultValue),
-            example: .init(example)
+            defaultValue: defaultValue.map { .init($0) },
+            example: example.map { .init($0) }
         )
     }
 }
diff --git a/Sources/FeatherOpenAPI/Schema/DoubleSchemaRepresentable.swift b/Sources/FeatherOpenAPI/Schema/DoubleSchemaRepresentable.swift
index b4a6287..b136a0d 100644
--- a/Sources/FeatherOpenAPI/Schema/DoubleSchemaRepresentable.swift
+++ b/Sources/FeatherOpenAPI/Schema/DoubleSchemaRepresentable.swift
@@ -40,8 +40,8 @@ extension DoubleSchemaRepresentable {
             maximum: nil,
             minimum: nil,
             allowedValues: allowedValues?.map { .init($0) },
-            defaultValue: .init(defaultValue),
-            example: .init(example)
+            defaultValue: defaultValue.map { .init($0) },
+            example: example.map { .init($0) }
         )
     }
 }
diff --git a/Sources/FeatherOpenAPI/Schema/FloatSchemaRepresentable.swift b/Sources/FeatherOpenAPI/Schema/FloatSchemaRepresentable.swift
index 7b641e7..923f708 100644
--- a/Sources/FeatherOpenAPI/Schema/FloatSchemaRepresentable.swift
+++ b/Sources/FeatherOpenAPI/Schema/FloatSchemaRepresentable.swift
@@ -40,8 +40,8 @@ extension FloatSchemaRepresentable {
             maximum: nil,
             minimum: nil,
             allowedValues: allowedValues?.map { .init($0) },
-            defaultValue: .init(defaultValue),
-            example: .init(example)
+            defaultValue: defaultValue.map { .init($0) },
+            example: example.map { .init($0) }
         )
     }
 }
diff --git a/Sources/FeatherOpenAPI/Schema/Int32SchemaRepresentable.swift b/Sources/FeatherOpenAPI/Schema/Int32SchemaRepresentable.swift
index ce2d557..ef446c9 100644
--- a/Sources/FeatherOpenAPI/Schema/Int32SchemaRepresentable.swift
+++ b/Sources/FeatherOpenAPI/Schema/Int32SchemaRepresentable.swift
@@ -40,8 +40,8 @@ extension Int32SchemaRepresentable {
             maximum: nil,
             minimum: nil,
             allowedValues: allowedValues?.map { .init($0) },
-            defaultValue: .init(defaultValue),
-            example: .init(example)
+            defaultValue: defaultValue.map { .init($0) },
+            example: example.map { .init($0) }
         )
     }
 }
diff --git a/Sources/FeatherOpenAPI/Schema/Int64SchemaRepresentable.swift b/Sources/FeatherOpenAPI/Schema/Int64SchemaRepresentable.swift
index 43e15a4..1f01181 100644
--- a/Sources/FeatherOpenAPI/Schema/Int64SchemaRepresentable.swift
+++ b/Sources/FeatherOpenAPI/Schema/Int64SchemaRepresentable.swift
@@ -40,8 +40,8 @@ extension Int64SchemaRepresentable {
             maximum: nil,
             minimum: nil,
             allowedValues: allowedValues?.map { .init($0) },
-            defaultValue: .init(defaultValue),
-            example: .init(example)
+            defaultValue: defaultValue.map { .init($0) },
+            example: example.map { .init($0) }
         )
     }
 }
diff --git a/Sources/FeatherOpenAPI/Schema/IntSchemaRepresentable.swift b/Sources/FeatherOpenAPI/Schema/IntSchemaRepresentable.swift
index 3030ef6..1dc3bf8 100644
--- a/Sources/FeatherOpenAPI/Schema/IntSchemaRepresentable.swift
+++ b/Sources/FeatherOpenAPI/Schema/IntSchemaRepresentable.swift
@@ -40,8 +40,8 @@ extension IntSchemaRepresentable {
             maximum: nil,
             minimum: nil,
             allowedValues: allowedValues?.map { .init($0) },
-            defaultValue: .init(defaultValue),
-            example: .init(example)
+            defaultValue: defaultValue.map { .init($0) },
+            example: example.map { .init($0) }
         )
     }
 }
diff --git a/Sources/FeatherOpenAPI/Schema/StringSchemaRepresentable.swift b/Sources/FeatherOpenAPI/Schema/StringSchemaRepresentable.swift
index f0d9223..a553c9d 100644
--- a/Sources/FeatherOpenAPI/Schema/StringSchemaRepresentable.swift
+++ b/Sources/FeatherOpenAPI/Schema/StringSchemaRepresentable.swift
@@ -40,8 +40,8 @@ extension StringSchemaRepresentable {
             maxLength: nil,
             pattern: nil,
             allowedValues: allowedValues?.map { .init($0) },
-            defaultValue: .init(defaultValue),
-            example: .init(example)
+            defaultValue: defaultValue.map { .init($0) },
+            example: example.map { .init($0) }
         )
     }
 }
diff --git a/Tests/FeatherOpenAPITests/SchemaSerializationTestSuite.swift b/Tests/FeatherOpenAPITests/SchemaSerializationTestSuite.swift
new file mode 100644
index 0000000..255404c
--- /dev/null
+++ b/Tests/FeatherOpenAPITests/SchemaSerializationTestSuite.swift
@@ -0,0 +1,84 @@
+import OpenAPIKit30
+import Testing
+import Yams
+
+@testable import FeatherOpenAPI
+
+@Suite
+struct SchemaSerializationTestSuite {
+
+    @Test
+    func omittedStringDefaultAndExampleDoNotSerializeAsNull() throws {
+        let yaml = try YAMLEncoder()
+            .encode(OmittedStringSchema().openAPISchema())
+        #expect(yaml.contains("default: null") == false)
+        #expect(yaml.contains("example: null") == false)
+    }
+
+    @Test
+    func omittedIntDefaultAndExampleDoNotSerializeAsNull() throws {
+        let yaml = try YAMLEncoder().encode(OmittedIntSchema().openAPISchema())
+        #expect(yaml.contains("default: null") == false)
+        #expect(yaml.contains("example: null") == false)
+    }
+
+    @Test
+    func omittedInt32DefaultAndExampleDoNotSerializeAsNull() throws {
+        let yaml = try YAMLEncoder()
+            .encode(OmittedInt32Schema().openAPISchema())
+        #expect(yaml.contains("default: null") == false)
+        #expect(yaml.contains("example: null") == false)
+    }
+
+    @Test
+    func omittedInt64DefaultAndExampleDoNotSerializeAsNull() throws {
+        let yaml = try YAMLEncoder()
+            .encode(OmittedInt64Schema().openAPISchema())
+        #expect(yaml.contains("default: null") == false)
+        #expect(yaml.contains("example: null") == false)
+    }
+
+    @Test
+    func omittedFloatDefaultAndExampleDoNotSerializeAsNull() throws {
+        let yaml = try YAMLEncoder()
+            .encode(OmittedFloatSchema().openAPISchema())
+        #expect(yaml.contains("default: null") == false)
+        #expect(yaml.contains("example: null") == false)
+    }
+
+    @Test
+    func omittedDoubleDefaultAndExampleDoNotSerializeAsNull() throws {
+        let yaml = try YAMLEncoder()
+            .encode(OmittedDoubleSchema().openAPISchema())
+        #expect(yaml.contains("default: null") == false)
+        #expect(yaml.contains("example: null") == false)
+    }
+
+    @Test
+    func omittedBoolDefaultAndExampleDoNotSerializeAsNull() throws {
+        let yaml = try YAMLEncoder().encode(OmittedBoolSchema().openAPISchema())
+        #expect(yaml.contains("default: null") == false)
+        #expect(yaml.contains("example: null") == false)
+    }
+
+    @Test
+    func explicitDefaultAndExampleStillSerialize() throws {
+        let yaml = try YAMLEncoder()
+            .encode(ExplicitStringSchema().openAPISchema())
+        #expect(yaml.contains("default: abc"))
+        #expect(yaml.contains("example: xyz"))
+    }
+}
+
+private struct OmittedStringSchema: StringSchemaRepresentable {}
+private struct OmittedIntSchema: IntSchemaRepresentable {}
+private struct OmittedInt32Schema: Int32SchemaRepresentable {}
+private struct OmittedInt64Schema: Int64SchemaRepresentable {}
+private struct OmittedFloatSchema: FloatSchemaRepresentable {}
+private struct OmittedDoubleSchema: DoubleSchemaRepresentable {}
+private struct OmittedBoolSchema: BoolSchemaRepresentable {}
+
+private struct ExplicitStringSchema: StringSchemaRepresentable {
+    var defaultValue: String? { "abc" }
+    var example: String? { "xyz" }
+}