In principle you're right. But you have to keep in mind, that type
hints actually alter runtime behavior.

A hinted call tries to cast its argument into the desired type,
possibly resulting in a type cast exception.
An unhinted call, on the other hand, just looks for the signature.

So in essence a hinted call can fail for cases where an unhinted call
succeeds, effectively reducing composability at a type level
(polymorphism).

kind regards
-- 
__________________________________________________________________
Herwig Hochleitner

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