When you change this to true, you may need to add more tests.
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enumerator. [GH-931] by kachick (Kenichi Kamiya)
* test/test_set.rb: Import tests from Set into SortedSet. [GH-931]
by kachick (Kenichi Kamiya)
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* lib/set.rb (Set#intersect?, Set#disjoint?): Add new methods for
testing if two sets have any element in common.
[ruby-core:45641] [Feature #6588] Based on the code by marcandre.
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utilizing super returning self, and add tests while at it.
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Set#keep_if more space and time efficient by avoiding to_a.
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