Generic of true value is typed to bool not true

[MartkCz]

Code snippet that reproduces the problem

https://phpstan.org/r/a3fd6456-8fa5-4913-a17f-9132cd2e1221

Expected output

onlyTrue return true[] instead of bool[]

[rvanvelzen]

This is the same problem as #6653 - the type is generalized because the bound is implied mixed.

[ondrejmirtes]

Last night I came up with the idea that we mostly shouldn't generalize the generic type variables, except when they're in object generics, like Foo<int>.

Here's the resulting PR: phpstan/phpstan-src#2818

We can't do this for objects, because I want new Collection([1, 2, 3]) to become Collection<int>. This could be improved in the future thanks to this suggestion: #6732 (comment) (but it's pretty complex to implement so for now it has to wait).

The new behaviour now only applies to bleeding edge (https://phpstan.org/blog/what-is-bleeding-edge) so definitely enable it to get the taste of the future 👍

[github-actions]

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