Reject or warn about additional attributes during object type conversion

[asaba-hashi]

Terraform Version

1.5.1

Terraform Configuration Files

type Things struct {
	A     types.Bool `tfsdk:"A"`
	B types.Bool `tfsdk:"B"`
}

type SomeResource struct {
   Things things
}

<snip>
"things": schema.SingleNestedAttribute{
				Attributes: map[string]schema.Attribute{
					"B": schema.BoolAttribute{
						Default:  booldefault.StaticBool(false),
						Optional: true,
						Computed: true,
					},
					"B": schema.BoolAttribute{
						Default:  booldefault.StaticBool(false),
						Optional: true,
						Computed: true,
					},
}
required: true,
}

resource "some_resource" "some_resource_name" {

  things = {
     A = true
     should_fail_to_validate = "but doesn't"
  }
}

Debug Output

n/a

Expected Behavior

terraform validate should fail with a message that an unknown key is present.

Actual Behavior

terraform validate/plan/apply all ran succesfully without errors or warning.

Steps to Reproduce

1. Include the above model and schema in a provider.
2. terraform validate.

Additional Context

It was suggested by @bflad to open an issue in this tracker instead, including some notes about what is being passed: https://github.com/hashicorp/terraform-plugin-framework/issues/805#issuecomment-1648521484

References

There appear to be a number of related issues already open:

• #28696
• #28727
• #29204
• #32015