* Reduce `index`, `async` and `non-secure` size (by polemius).
2.1.6
* Reduce size (by Stas Lashmanov). * Return fast mask for Node.js.
2.1.5
* Reduce size (by Max Graey). * Fix IE support.
2.1.4
* Reduce `generate` size (by Vsevolod Rodionov). * Reduce `format` and `format` size (by Victor). * Reduce `async`, `non-secure` and `non-secure/generate` size. * Speed up `format` and `async/format` (by Max Graey). * Improve development process on Windows (by Stanislav Lashmanov).
2.1.3
* Improve performance (by Stephen Richardson). * Reduce size (by Stephen Richardson).