What's a packagist's "provides" value?

[ostrolucky]

For example, PSR-6 is psr/cache-implementation. I wanted to check if there are some implementations of this RFC but not sure what should I search for.

[ramsey]

Right now, there's only one implementation of this spec, as it's the implementation I've been using as a proving ground for it. However, there are no releases of the package yet.

You can see search for identifier/identifier-implementation to find the implementation.