diff --git a/Sources/DeveloperAPI/patch.js b/Sources/DeveloperAPI/patch.js
index 064af46..8c6aed0 100644
--- a/Sources/DeveloperAPI/patch.js
+++ b/Sources/DeveloperAPI/patch.js
@@ -2,58 +2,87 @@
 
 import fs from 'fs';
 
-function makeOpen(enumSchema) {
-    const copy = structuredClone(enumSchema);
-    Object.keys(enumSchema).forEach(k => delete enumSchema[k]);
-    Object.assign(enumSchema, {
-        anyOf: [
-            copy,
-            { type: 'string' },
-        ]
-    })
+function update(schema, value) {
+  for (const key in value) {
+    const val = value[key];
+    if (val === null) {
+      delete schema[key];
+    } else if (Array.isArray(val)) {
+      schema[key] = (schema[key] ?? []).concat(val);
+    } else if (typeof val === 'object') {
+      if (schema[key] === undefined) {
+        schema[key] = {};
+      }
+      update(schema[key], val);
+    } else {
+      schema[key] = val;
+    }
+  }
 }
 
-function format(schema) {
-    const schemas = schema.components.schemas;
+// in-place update
+function replace(schema, value) {
+  Object.keys(schema).forEach(k => delete schema[k]);
+  Object.assign(schema, value);
+}
 
-    // this field is required when using the private Xcode API
-    const capabilityCreateRelationships = schemas.BundleIdCapabilityCreateRequest.properties.data.properties.relationships;
-    capabilityCreateRelationships.properties.capability = {
+function clone(schema) {
+  return JSON.parse(JSON.stringify(schema));
+}
+
+function makeOpen(enumSchema) {
+  replace(enumSchema, {
+    anyOf: [
+      clone(enumSchema),
+      { type: 'string' },
+    ]
+  });
+}
+
+function patch(schema) {
+  const schemas = schema.components.schemas;
+  
+  // this field is required when using the private Xcode API
+  update(schemas.BundleIdCapabilityCreateRequest.properties.data.properties.relationships, {
+    properties: {
+      capability: {
         type: 'object',
         properties: {
-            data: {
-                type: 'object',
-                properties: {
-                    type: {
-                        type: 'string',
-                        enum: ['capabilities'],
-                    },
-                    id: { $ref: '#/components/schemas/CapabilityType' },
-                },
-                required: ['id', 'type'],
+          data: {
+            type: 'object',
+            properties: {
+              type: {
+                type: 'string',
+                enum: ['capabilities'],
+              },
+              id: { $ref: '#/components/schemas/CapabilityType' },
             },
+            required: ['id', 'type'],
+          },
         },
         required: ['data'],
-    }
-    capabilityCreateRelationships.required.push('capability');
-
-    // we don't use this but it triggers a deprecation warning. see:
-    // https://github.com/apple/swift-openapi-generator/issues/715
-    schemas.App.properties.relationships.properties.inAppPurchases.deprecated = false;
-
-    // openapi-generator expects response enums to be exhaustive. Apple's ASC OpenAPI spec
-    // misses some cases that they do, actually, return.
-    // https://swiftpackageindex.com/apple/swift-openapi-generator/1.7.2/documentation/swift-openapi-generator/useful-openapi-patterns#Open-enums-and-oneOfs
-    makeOpen(schemas.BundleIdPlatform);
-    makeOpen(schemas.CapabilityType);
-    makeOpen(schemas.CertificateType);
-    makeOpen(schemas.Device.properties.attributes.properties.deviceClass);
-
-    return schema;
+      }
+    },
+    required: ['capability'],
+  })
+  
+  // we don't use this but it triggers a deprecation warning. see:
+  // https://github.com/apple/swift-openapi-generator/issues/715
+  schemas.App.properties.relationships.properties.inAppPurchases.deprecated = false;
+  
+  // openapi-generator expects response enums to be exhaustive. Apple's ASC OpenAPI spec
+  // misses some cases that they do, actually, return.
+  // https://swiftpackageindex.com/apple/swift-openapi-generator/1.7.2/documentation/swift-openapi-generator/useful-openapi-patterns#Open-enums-and-oneOfs
+  makeOpen(schemas.BundleIdPlatform);
+  makeOpen(schemas.CapabilityType);
+  makeOpen(schemas.CertificateType);
+  makeOpen(schemas.Device.properties.attributes.properties.deviceClass);
+  
+  return schema;
 }
 
 const text = fs.readFileSync(process.stdin.fd, 'utf8');
 const json = JSON.parse(text);
-const formatted = format(json);
-const formattedText = JSON.stringify(formatted);
-console.log(formattedText);
+const patched = patch(json);
+const patchedText = JSON.stringify(patched);
+console.log(patchedText);