diff --git a/packages/zod/package.json b/packages/zod/package.json
index 7affffe0de..7eb789663a 100644
--- a/packages/zod/package.json
+++ b/packages/zod/package.json
@@ -1,6 +1,6 @@
 {
   "name": "zod",
-  "version": "3.25.61",
+  "version": "3.25.62",
   "type": "module",
   "author": "Colin McDonnell <zod@colinhacks.com>",
   "description": "TypeScript-first schema declaration and validation library with static type inference",
diff --git a/packages/zod/src/v4/core/json-schema.ts b/packages/zod/src/v4/core/json-schema.ts
index aa8821613b..4b3abfbe02 100644
--- a/packages/zod/src/v4/core/json-schema.ts
+++ b/packages/zod/src/v4/core/json-schema.ts
@@ -10,105 +10,105 @@ export type Schema =
 // export type JsonType = "object" | "array" | "string" | "number" | "boolean" | "null" | "integer";
 
 // export interface JSONSchema {
-//   type?: string | undefined;
-//   $id?: string | undefined;
-//   id?: string | undefined;
-//   $schema?: string | undefined;
-//   $ref?: string | undefined;
-//   $anchor?: string | undefined;
-//   $defs?: { [key: string]: JSONSchema } | undefined;
-//   definitions?: { [key: string]: JSONSchema } | undefined;
-//   $comment?: string | undefined;
-//   title?: string | undefined;
-//   description?: string | undefined;
-//   default?: unknown | undefined;
-//   examples?: unknown[] | undefined;
-//   readOnly?: boolean | undefined;
-//   writeOnly?: boolean | undefined;
-//   deprecated?: boolean | undefined;
-//   allOf?: JSONSchema[] | undefined;
-//   anyOf?: JSONSchema[] | undefined;
-//   oneOf?: JSONSchema[] | undefined;
-//   not?: JSONSchema | undefined;
-//   if?: JSONSchema | undefined;
-//   then?: JSONSchema | undefined;
-//   else?: JSONSchema | undefined;
-//   enum?: Array<string | number | boolean | null> | undefined;
-//   const?: string | number | boolean | null | undefined;
+//   type?: string ;
+//   $id?: string ;
+//   id?: string ;
+//   $schema?: string ;
+//   $ref?: string ;
+//   $anchor?: string ;
+//   $defs?: { [key: string]: JSONSchema } ;
+//   definitions?: { [key: string]: JSONSchema } ;
+//   $comment?: string ;
+//   title?: string ;
+//   description?: string ;
+//   default?: unknown ;
+//   examples?: unknown[] ;
+//   readOnly?: boolean ;
+//   writeOnly?: boolean ;
+//   deprecated?: boolean ;
+//   allOf?: JSONSchema[] ;
+//   anyOf?: JSONSchema[] ;
+//   oneOf?: JSONSchema[] ;
+//   not?: JSONSchema ;
+//   if?: JSONSchema ;
+//   then?: JSONSchema ;
+//   else?: JSONSchema ;
+//   enum?: Array<string | number | boolean | null> ;
+//   const?: string | number | boolean | null ;
 //   [k: string]: unknown;
 
 //   /** A special key used as an intermediate representation of extends-style relationships. Omitted as a $ref with additional properties. */
 //   // _ref?: JSONSchema;
-//   _prefault?: unknown | undefined;
+//   _prefault?: unknown ;
 // }
 
 export type _JSONSchema = boolean | JSONSchema;
 export type JSONSchema = {
   [k: string]: unknown;
-  $schema?: "https://json-schema.org/draft/2020-12/schema" | "http://json-schema.org/draft-07/schema#" | undefined;
-  $id?: string | undefined;
-  $anchor?: string | undefined;
-  $ref?: string | undefined;
-  $dynamicRef?: string | undefined;
-  $dynamicAnchor?: string | undefined;
-  $vocabulary?: Record<string, boolean> | undefined;
-  $comment?: string | undefined;
-  $defs?: Record<string, JSONSchema> | undefined;
-  type?: "object" | "array" | "string" | "number" | "boolean" | "null" | "integer" | undefined;
-  additionalItems?: _JSONSchema | undefined;
-  unevaluatedItems?: _JSONSchema | undefined;
-  prefixItems?: _JSONSchema[] | undefined;
-  items?: _JSONSchema | _JSONSchema[] | undefined;
-  contains?: _JSONSchema | undefined;
-  additionalProperties?: _JSONSchema | undefined;
-  unevaluatedProperties?: _JSONSchema | undefined;
-  properties?: Record<string, _JSONSchema> | undefined;
-  patternProperties?: Record<string, _JSONSchema> | undefined;
-  dependentSchemas?: Record<string, _JSONSchema> | undefined;
-  propertyNames?: _JSONSchema | undefined;
-  if?: _JSONSchema | undefined;
-  then?: _JSONSchema | undefined;
-  else?: _JSONSchema | undefined;
-  allOf?: JSONSchema[] | undefined;
-  anyOf?: JSONSchema[] | undefined;
-  oneOf?: JSONSchema[] | undefined;
-  not?: _JSONSchema | undefined;
-  multipleOf?: number | undefined;
-  maximum?: number | undefined;
-  exclusiveMaximum?: number | undefined;
-  minimum?: number | undefined;
-  exclusiveMinimum?: number | undefined;
-  maxLength?: number | undefined;
-  minLength?: number | undefined;
-  pattern?: string | undefined;
-  maxItems?: number | undefined;
-  minItems?: number | undefined;
-  uniqueItems?: boolean | undefined;
-  maxContains?: number | undefined;
-  minContains?: number | undefined;
-  maxProperties?: number | undefined;
-  minProperties?: number | undefined;
-  required?: string[] | undefined;
-  dependentRequired?: Record<string, string[]> | undefined;
-  enum?: Array<string | number | boolean | null> | undefined;
-  const?: string | number | boolean | null | undefined;
+  $schema?: "https://json-schema.org/draft/2020-12/schema" | "http://json-schema.org/draft-07/schema#";
+  $id?: string;
+  $anchor?: string;
+  $ref?: string;
+  $dynamicRef?: string;
+  $dynamicAnchor?: string;
+  $vocabulary?: Record<string, boolean>;
+  $comment?: string;
+  $defs?: Record<string, JSONSchema>;
+  type?: "object" | "array" | "string" | "number" | "boolean" | "null" | "integer";
+  additionalItems?: _JSONSchema;
+  unevaluatedItems?: _JSONSchema;
+  prefixItems?: _JSONSchema[];
+  items?: _JSONSchema | _JSONSchema[];
+  contains?: _JSONSchema;
+  additionalProperties?: _JSONSchema;
+  unevaluatedProperties?: _JSONSchema;
+  properties?: Record<string, _JSONSchema>;
+  patternProperties?: Record<string, _JSONSchema>;
+  dependentSchemas?: Record<string, _JSONSchema>;
+  propertyNames?: _JSONSchema;
+  if?: _JSONSchema;
+  then?: _JSONSchema;
+  else?: _JSONSchema;
+  allOf?: JSONSchema[];
+  anyOf?: JSONSchema[];
+  oneOf?: JSONSchema[];
+  not?: _JSONSchema;
+  multipleOf?: number;
+  maximum?: number;
+  exclusiveMaximum?: number;
+  minimum?: number;
+  exclusiveMinimum?: number;
+  maxLength?: number;
+  minLength?: number;
+  pattern?: string;
+  maxItems?: number;
+  minItems?: number;
+  uniqueItems?: boolean;
+  maxContains?: number;
+  minContains?: number;
+  maxProperties?: number;
+  minProperties?: number;
+  required?: string[];
+  dependentRequired?: Record<string, string[]>;
+  enum?: Array<string | number | boolean | null>;
+  const?: string | number | boolean | null;
 
   // metadata
-  id?: string | undefined;
-  title?: string | undefined;
-  description?: string | undefined;
-  default?: unknown | undefined;
-  deprecated?: boolean | undefined;
-  readOnly?: boolean | undefined;
-  writeOnly?: boolean | undefined;
-  examples?: unknown[] | undefined;
-  format?: string | undefined;
-  contentMediaType?: string | undefined;
-  contentEncoding?: string | undefined;
-  contentSchema?: JSONSchema | undefined;
+  id?: string;
+  title?: string;
+  description?: string;
+  default?: unknown;
+  deprecated?: boolean;
+  readOnly?: boolean;
+  writeOnly?: boolean;
+  examples?: unknown[];
+  format?: string;
+  contentMediaType?: string;
+  contentEncoding?: string;
+  contentSchema?: JSONSchema;
 
   // internal
-  _prefault?: unknown | undefined;
+  _prefault?: unknown;
 };
 
 // for backwards compatibility
diff --git a/play.ts b/play.ts
index a07a807805..41eb006bd0 100644
--- a/play.ts
+++ b/play.ts
@@ -1,10 +1,3 @@
 import { z } from "zod/v4";
 
-const A = z.string().describe("name");
-const B = A.superRefine((val, ctx) => {
-  ctx.addIssue({
-    message: `Invalid ${A.description}`,
-  });
-});
-
-B.parse("test"); // Should pass
+z;