JTDSchemaType derivation for enums is too strict

[swachter]

What version of Ajv are you using? Does the issue happen if you use the latest version?

8.12.0

Ajv options object

none

Your code

type AB = 'a' | 'b'
const s1 = { enum: ['a', 'b'] } as const
const enum1: JTDSchemaType<AB> = s1
// error: The type 'readonly ["a", "b"]' is 'readonly' and cannot be assigned to the mutable type 'AB[]'.

What results did you expect?

Assignment should be possible.

Are you going to resolve the issue?
I can prepare a PR

[epoberezkin]

This is not something that is easy (or maybe even possible) to improve given typescript type system limitations.

[StefanWachter1507]

Did you see #2359?