Re: [PATCH v3 00/14] Remove more index compatibility macros

"Derrick Stolee via GitGitGadget" [off-list ref] writes:

UPDATE: this is now based on ag/merge-strategies-in-c to avoid conflicts in
'seen'. The changes in builtin/rm.c still conflict with
mt/rm-sparse-checkout, but that branch seems to be waiting for a clearer
plan on some corner cases. I thought about ejecting it, but 'rm' still uses
ce_match_stat(), so just dropping the patch gives less of a final stake at
the end of the series. (I'm still open to it, if necessary.)

I haven't read this latest iteration myself yet beyond the cover
letter, but tonight's 'seen' has this queued near its tip.  I expect
it would either stay there or occasionally ejected, until the base
topic solidifies a bit more.

 * Methods that know about the 'repo' pointer no longer also have an
   'istate' pointer and instead prefer 'repo->index'

 * This includes the callback_data struct which only has a 'repo' member, no
   'istate'.

OK.