Use FunctionLike contract instead of union of function-like concrete implementations
#4241
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…e implementations
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It does not make sense to use
ClassMethod | Function_ | Closure | ArrowFunctionbecause when consuming such contract it requires usinginstanceofanyway (same as withFunctionLikeinterface). Also, it forces custom rectors to use union too in the signatures, but if PHP 7.4 is used, there's no way to achieve it with native types and phpDoc has to be used instead.