>>> Given that macrostep is useful for Emacs Lisp macro development, would
>>> there be interest to include in Emacs core?
>>
>> Sounds useful, so I'm in favor.
>
> OK, I will continue to work towards it.

Eli, Stefan,

As I wait for the FSF paperwork to be completed for several
contributors:

Manual?
Should the documentation for macrostep be included in the Emacs Lisp
manual section Macros?  Or a more suitable location?  I volunteer to
write the manual sections.

Code?
The main file is attached for convenience, from the orphanage upstream
(https://github.com/emacsorphanage/macrostep). 
Are any changes needed before this is merged into Emacs?
I volunteer to write some code towards this, please let me know.