How to experiment with a proposal before Stage 4

[littledan]

For JavaScript programmers who want to be adventurous and give TC39 feedback on proposals, there are various ways they can try things out:

• Invoke transpilers and polyfills at early stages; link to documentation for multiple of these (e.g., don't privilege Babel in this discussion), or use Node or browsers with new feature flags set
• Understand the stability risk in using early stage features. Until a feature is at Stage 3, it is subject to significant change, and tweaks will continue after Stage 3.
• When you have feedback, file it as an issue in GitHub