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smallwig
https://smallwig.blogspot.com/2007/12/why-does-setcontains-take-object-not-e.html?showComment=1552454135635
smallwig: Why does Set.contains() take an Object, not an E?
setcontainstakeobject
https://smallwig.blogspot.com/2007/12/why-does-setcontains-take-object-not-e.html?showComment=1557232956995
smallwig: Why does Set.contains() take an Object, not an E?
setcontainstakeobject