Note: Atom has been at v1.x for over a year, so this appendix is mostly obsolete at this point. We're retaining it for historic and reference purposes.
Atom is at 1.0! Much of the effort leading up to the 1.0 has been cleaning up APIs in an attempt to future proof, and make a more pleasant experience developing packages. If you have developed packages or syntaxes for Atom before the 1.0 API, you can find some tips on upgrading your work in this appendix.