[ content ] objects and fixes

[ typo ] Types from the index and second and third sections.

[ admin ] point to github

[ fix ] minor typo

[ content ] more addendum

[ addendum ] interfaces

[ content ] typo

[ content ] typo fixes and content on generics

[ code ] the original three-way guide

[ content ] basics overview

[ content ] first draft basics

[ updates ] add tocs and other fixes.

[ content ] sequences...

[ content ] on basics and improvements to datatypes.

[ topics & styling ]