This is a detail header used to maintain compatability with the 5.2 and 5.3 APIs. It contains code from the MIT-Licensed `Lua code`_ in some places and also from the `lua-compat`_ repository by KeplerProject.
It is not fully documented as this header's only purpose is for internal use to make sure Sol compiles across all platforms / distributions with no errors or missing Lua functionality. If you think there's some compatibility features we are missing or if you are running into redefinition errors, please make an `issue in the issue tracker`_.