*NOTE:* functional-php used to come with a C extension that implemented most of the functions natively. As the

performance differences weren’t that huge compared to the maintenance cost it has been removed.

- [David Soria Parra](https://github.com/dsp) for various ideas and the userland version of `Functional\flatten()`

- [Max Beutel](https://github.com/maxbeutel) for `Functional\unique()`, `Functional\invoke_first()`,

`Functional\invoke_last()` and all the discussions