2017-08-09 12:23 GMT+09:00 Xiaodi Wu <xiaodi...@gmail.com>:

For consistency, the name for this function would be `isSuperset(of:)`, and
it would be equally interesting to have `isStrictSuperset(of:)`,
`isSubset(of:)`, `isStrictSubset(of:)` and `isDisjoint(with:)`--all
currently available for types that conform to `SetAlgebra`.

Thank you for your feedback. It certainly seems better to rename `contains`
to `isSuperset(of:)`. Also I'll try to implement `isStrictSuperset(of:)`
and so on.

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