Some of these we want in git.
Some examples.
Move these.
Allow inheriting the typesetter; have a useful function which puts things into a frame.
Use the "typeset naturally" function for folio frames.
Allow permanent font changes.
Move leading to its own function for overridability.
Always pushback, allows clever stuff.
Debuggery.
Implement grid typesetting. Wasn't that hard, was it?