An unordered multiset/bag implementation backed by HashMap.

A bag, unlike a set, allows duplicate values, and keeps track of how many duplicates each value holds. This type of collection is often referred to as an unordered multiset (see also C++'s std::unordered_multiset).

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• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

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