A place mainly for devs/contributors to keep track of any breaking changes we'd like to put into the next major release.

• maybe ascii=IS_NIX Windows 10 bug #556 (comment)
• be careful about naming conventions (underscores for things intended to be private/protected)
  • moveto
• submodules requiring slightly different import syntax should not import optional dependencies until actually necessary #176, Pythonic submodules architecture #198 (comment)
  • remember to update MANIFEST.in
• default lock_args=(False,) for native multi-threading efficiency