Docs say this is still a proof of concept

[davidben]

The documentation for rules_license says:

Proof of concept. License restriction.

https://bazelbuild.github.io/rules_license/latest.html

That seems to suggest this is not yet ready for general use, but Bazel's documentation already suggests using it. https://bazel.build/reference/be/functions#package.default_package_metadata

Is the documentation out-of-date, or is this package not yet ready?