Respect generic arity in method uniqueness #17804
Merged
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Description
Fixes #17796 .
An internal function for finding method definition based on a method reference existed for a long time, used on multiple places (events, base type calls,..).
It checked for equal name, return type, argument number and argument types.
However, there are APIs which are equal in all of that, and only differ in their generic arity = the number of generic arguments.
The very common
AddSingleton<> vs AddSingleton<,>
is one of them.