v4: meta not kept when using z.stringbool()

[arthurvanl]

Minimal reproduction:

export const _userSchema = z.interface({
    daily_1: z.string().meta({description: 'oke', primary: true}),
    d: z.email()
    // daily_report_mail: z.stringbool(({truthy: ['1', 'true'], falsy: ['0', 'false']})).meta({title: 'asdasdasd',description: 'Whether this user should receive daily csv report emails', examples: [false]}),
})
console.dir(z.toJSONSchema(_userSchema), {depth: 4})

Version: ^4.0.0-beta.20250412T085909

Method	Meta Kept	Info
z.string()	✅
z.email()	✅
z.int()	✅
z.number()	✅
z.boolean()	✅
z.bigint()	⚠️	Couldn't be tested in objects, so I dont feel like using
z.undefined()	✅
z.symbol()	⚠️	Couldn't be tested in objects, so I dont feel like using
z.null()	✅
z.coerce.string()	✅
z.coerce.number()	✅
z.coerce.boolean()	✅
z.literal()	✅
z.templateLiteral()	✅
z.stringbool()	❌
z.optional(z.stringbool()).meta({description: 'oke'})	✅
z.optional(z.stringbool().meta({description: 'oke'}))	❌