Fix ^ to respect subclasses
#38
Merged
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Suppose we define
MySetas a subclass ofSet.The methods
MySet#&,MySet#|, andMySet#-all return an instance ofMySet, but onlyMySet#^returns an instance ofSet.Wouldn't it be better if
^also returned an instance ofMySet?When
Setwas introduced in Ruby 1.8.0, the implementation up to 1.8.5 returned an instance ofMySet.This behavior changed at the following commit: a4104d6.