Bug report

In #7031, I reported two issues when trying to infer the key of an iterable, but forgot to create a separate issue as was asked. Here it is.

Code snippet that reproduces the problem

https://phpstan.org/r/efdae2f5-0033-4a4f-8c6d-66c31136829f
https://phpstan.org/r/884d3d97-9b8d-4924-8559-5b8c7449ef31

Expected output

The type should be properly inferred both for the simple string and the complex (class constant) one.

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Just upgraded to the latest version and had yet one less issue reported in my project's baseline. <3 Thank you for all your hard work!