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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`]).
[`std::unordered_multiset`]: http://www.cplusplus.com/reference/unordered_set/unordered_multiset/
## License
Licensed under either of
* Apache License, Version 2.0
([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license
([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
## Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.