what is the convention for `info' and `Info'?

[Drew Adams]

Library info.el has a mix of vars, faces, and functions with names that begin
with `info' or `Info'.  What is the convention here - when to use one or the
other?  There doesn't seem to be any rhyme or (non-hysterical) reason.

There are internal vars and user options that use `Info'.  All defvars except
`info-tool-bar-map' use `Info' (53/54).  All defcustoms use `Info'.  But all
deffaces (which are also for user customization) use `info'.

There are commands that use `info' and commands that use `Info'.  Perhaps the
intended difference here is commands within *info* and commands to be used
anywhere (?).  Similarly, there are non-interactive functions that use one or
the other.

This cannot, AFAICT, be helpful to users (or to maintainers, for that matter).