Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure it has not already been reported

Fastify version

3.0.0

Plugin version

3.0.0

Node.js version

16.2.0

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

18.04

Description

I think root level required calls should be ignored, because it creates an invalid schema

Steps to Reproduce

const s = S.object().required().prop('foo', S.string())
ajv.compile(s.valueOf())

Result:

Error: schema is invalid: data/required/0 must be string

Because s.valueOf().required array contains a symbol but it expected to be an array of string

Expected Behavior

S.object().required().prop('foo', S.string()).valueOf() should return a valid json-schema