Equals validator for boolean types

[jar-b]

Terraform CLI and Framework Versions

% terraform version
Terraform v1.9.5
on darwin_arm64

% cat go.mod | rg terraform-plugin-framework
        github.com/hashicorp/terraform-plugin-framework v1.11.0
        github.com/hashicorp/terraform-plugin-framework-jsontypes v0.2.0
        github.com/hashicorp/terraform-plugin-framework-timeouts v0.4.1
        github.com/hashicorp/terraform-plugin-framework-timetypes v0.5.0
        github.com/hashicorp/terraform-plugin-framework-validators v0.13.0

Use Cases or Problem Statement

The AWS provider recently implemented a resource which included a boolean argument that should only ever be null or true. To enforce this condition, we added a custom BoolEquals validator that confirms a non-null boolean value exactly matches that which the validator is configured with (in our case true).

I'm not sure if this use case is a common enough to warrant moving up into this repository, but thought I'd offer up our implementation just in case.

Proposal

Add a new Equals validator to the boolvalidator package.

Additional Information

The AWS provider implemented a custom version of this in a recent pull request:
hashicorp/terraform-provider-aws#39180

Code of Conduct

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