`HashRefSet` and `HashType` both implement `Serialize` and `Deserialize` from the `serde` crate if the `serde` feature is enabled. By default it is not.
Since the item is not inserted itself, we cannot use `Eq` to double check there was not a hash collision.
While the hashing algorithm used (Sha512) is extremely unlikely to produce collisions, especially for small data types, keep in mind that it is not infallible.
* The type you're inserting needs to be both in the set and moved elsewhere. (see exmaple)
* Simply using `Clone` to insert a copy of the item into a `HashSet` is not possible (non-`Clone` type) or is a significantly heavy operation. (see benchmarks)
* The fallibility of potential (albeing extremely unlikely) collisions of the SHA512 algorithm is not a concern
* You need to insert an unsized type into a `HashSet`