Improve the generic types

[stof]

phpstan does not like when you have a template type for which the bound (which was mixed before due to being omitted) is not compatible with the native parameter type. Because of that, it would ignore the @psalm-template annotation and then cause issues with the @param-out type.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4a20654) to head (85ffb7a).

Additional details and impacted files

@@             Coverage Diff             @@
##                main       #29   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        16        16           
===========================================
  Files              1         1           
  Lines             37        37           
===========================================
  Hits              37        37           

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[sebastianbergmann]

Cherry-picked into 5.0 and merged to main from there.