Allow readonly T[] in oneOf

[beaucollins]

readonly T[] is a subset of T[]

Ideally we could do this:

import * as cmd from 'cmd-ts';

const options = ['a', 'b', 'c'] as const;

const option = cmd.oneOf(options);

https://www.typescriptlang.org/play?#code/JYWwDg9gTgLgBAKjgQwM5wMYgCZwGZQQhwDkW2AtDKiQNwCwAUExhAHarwRgzDvoBeOAG0SyEgBpSAI0mkMJALop0rDjAbNGaznG692cIeQB07AKYB5PAAp9fDgEpaQA

One workaround is using .slice() to turn it into a non-readonly array

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a749ae841470b0040b80bda592ff2cf0b3946478

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------ | ----- | | cmd-ts | Patch |

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Name	Status	Preview	Updated
cmd-ts	❌ Failed (Inspect)		Jan 11, 2023 at 7:45PM (UTC)

[Schniz]

Thank you!

[beaucollins]

My pleasure! Thanks for cmd-ts!