- PHP RFC: Parameter Type Widening
- PHP RFC: Return Type Declarations
- https://en.wikipedia.org/wiki/Covariance_and_contravariance_(computer_science)
- https://en.wikipedia.org/wiki/Liskov_substitution_principle
- https://en.wikipedia.org/wiki/Type_system
- https://en.wikipedia.org/wiki/Top_type
- https://en.wikipedia.org/wiki/Bottom_type
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Covariance and contravariance in PHP & PHPStan