zfc 0.4.3

Trait that represents a set according to Zermelo–Fraenkel set theory with the axiom of choice (ZFC).
Documentation
# `zfc`

[<img alt="git" src="https://git.philomathiclife.com/badges/zfc.svg" height="20">](https://git.philomathiclife.com/zfc/log.html)
[<img alt="crates.io" src="https://img.shields.io/crates/v/zfc.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/zfc)
[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-zfc-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/zfc/latest/zfc/)

`zfc` is a library for sets according to
[Zermelo–Fraenkel set theory with the axiom of choice (ZFC)](https://en.wikipedia.org/wiki/Zermelo%E2%80%93Fraenkel_set_theory).

## Minimum Supported Rust Version (MSRV)

This will frequently be updated to be the same as stable. Specifically, any time stable is updated and that
update has "useful" features or compilation no longer succeeds (e.g., due to new compiler lints), then MSRV
will be updated.

MSRV changes will correspond to a SemVer patch version bump pre-`1.0.0`; otherwise a minor version bump.

## SemVer Policy

* All on-by-default features of this library are covered by SemVer
* MSRV is considered exempt from SemVer as noted above

## License

Licensed under either of

* Apache License, Version 2.0 ([LICENSE-APACHE]https://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT]https://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.

Before any PR is sent, `cargo clippy` and `cargo t` should be run for both `--no-default-features` and
`--all-features`. Additionally `RUSTDOCFLAGS="--cfg docsrs" cargo +nightly doc --all-features` should be run to
ensure documentation can be built.

### Status

The crate is only tested on `x86_64-unknown-linux-gnu` and `x86_64-unknown-openbsd` targets, but it should work
on most platforms.