Slight sanity/clarity improvement to the way VisitableType binds the _compiler_dispatch. This code change has no functional or performance implications, but it helps make the docstring easier to write.
Slight sanity/clarity improvement to the way VisitableType binds the
_compiler_dispatch. This code change has no functional or performance
implications, but it helps make the docstring easier to write.

Mostly this commit is about docstring improvements and comments
to explain optimizations.

graingert/sqlalchemy,bdupharm/sqlalchemy,Akrog/sqlalchemy,itkovian/sqlalchemy,itkovian/sqlalchemy,alex/sqlalchemy,halfcrazy/sqlalchemy,inspirehep/sqlalchemy,elelianghh/sqlalchemy,zzzeek/sqlalchemy,brianv0/sqlalchemy,robin900/sqlalchemy,Cito/sqlalchemy,graingert/sqlalchemy,dstufft/sqlalchemy,j5int/sqlalchemy,epa/sqlalchemy,wfxiang08/sqlalchemy,Cito/sqlalchemy,halfcrazy/sqlalchemy,alex/sqlalchemy,epa/sqlalchemy,wfxiang08/sqlalchemy,monetate/sqlalchemy,hsum/sqlalchemy,davidfraser/sqlalchemy,EvaSDK/sqlalchemy,WinterNis/sqlalchemy,276361270/sqlalchemy,276361270/sqlalchemy,monetate/sqlalchemy,inspirehep/sqlalchemy,elelianghh/sqlalchemy,olemis/sqlalchemy,sandan/sqlalchemy,davidfraser/sqlalchemy,Akrog/sqlalchemy,bootandy/sqlalchemy,j5int/sqlalchemy,davidjb/sqlalchemy,wujuguang/sqlalchemy,olemis/sqlalchemy,dstufft/sqlalchemy,sandan/sqlalchemy,pdufour/sqlalchemy,bootandy/sqlalchemy,ThiefMaster/sqlalchemy,davidjb/sqlalchemy,wujuguang/sqlalchemy,pdufour/sqlalchemy,WinterNis/sqlalchemy,robin900/sqlalchemy,Cito/sqlalchemy,sqlalchemy/sqlalchemy,alex/sqlalchemy,EvaSDK/sqlalchemy,ThiefMaster/sqlalchemy,bdupharm/sqlalchemy,hsum/sqlalchemy,brianv0/sqlalchemy