This is a Hype AnimationFrame, a wrapper for window.requestAnimationFrame (without polyfill for it). Will keep polyfills from now on separate, so projects that already use them don’t load them twice.
Example Hype File:
1.0 Initial release under MIT
1.1 Converted into a self contained extension
1.2 Added id, scope and refactored names
PPS: Looking forward to these extended symbols so we have unified distribution of this stuff