Improve stringbool docs

Author: colinhacks

packages/docs/content/api.mdx

@@ -733,10 +733,11 @@ strbool.parse(/* anything else */); // ZodError<[{ code: "invalid_value" }]>
 To customize the truthy and falsy values:
 
 ```ts
+// these are the defaults
 z.stringbool({
-  truthy: ["yes", "true"],
-  falsy: ["no", "false"]
-})
+  truthy: ["true", "1", "yes", "on", "y", "enabled"],
+  falsy: ["false", "0", "no", "off", "n", "disabled"],
+});
 ```
 
 Be default the schema is *case-insensitive*; all inputs are converted to lowercase before comparison to the `truthy`/`falsy` values. To make it case-sensitive:

play.ts

@@ -1,3 +1,23 @@
 import { z } from "zod/v4";
 
 z;
+
+function inferSchema<T extends z.core.$ZodType>(data: unknown, schema: T) {
+  return parseData(data, schema);
+}
+
+function parseData<T extends z.core.$ZodType>(data: unknown, schema: T): z.output<T> {
+  return z.parse(schema, data);
+}
+
+const A = z.union([z.stringbool(), z.literal([null, undefined]).transform((v) => !!v)]);
+
+console.dir(A.parse(undefined), { depth: null });
+console.dir(A.parse(null), { depth: null });
+console.dir(A.parse("true"), { depth: null });
+console.dir(A.parse("false"), { depth: null });
+
+z.stringbool({
+  truthy: ["true", "1", "yes", "on", "y", "enabled"],
+  falsy: ["false", "0", "no", "off", "n", "disabled"],
+});