Test whether another object is equal to this function.
System-created function objects are only equal to other functions.
Two function objects are known to represent the same function if
Function expressions never give rise to equal function objects. Each time a function expression is evaluated, it creates a new closure value that is not known to be equal to other closures created by the same expression.
Function by having a
call method should have their own
hashCode depending on the object.
bool operator ==(Object other);
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