xattr.TypeWithValidate support for list elements (and possibly contents of other collections)

[Doridian]

Module version

github.com/hashicorp/terraform-plugin-framework v0.11.1

Use-cases

I want to make a list that validates its contents, such as a list of IP addresses

Attempted Solutions

I created an entirely separate type called ValidatedList. This does work, but it prevents anything that is used to dealing with types.List (such as pre-made validators) from interacting with those lists.

See my currently working solutin (albeit without the build-in validators I'd love to be able to use): https://github.com/Doridian/terraform-provider-hexonet/blob/main/hexonet/utils/validated_list.go

Another solution would be to use listvalidator.ValuesAre, but if the value creator (in the case of IPs for example) fails by creating a nil value (such as un-parseable IP), then this cannot work.

Proposal

Implement xattr.TypeWithValidate's Validate function in lists (and possibly other collections)
Add type coercion to collection types and if their element type is a xattr.TypeWithValidate, run its Validate function and actr accordingly.

References

I could not find any prior issue referring to xattr.TypeWithValidate in collections.

[github-actions]

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