Git documentation defines commit ancestry as "reachability" of one commit 
from another.
Formally, this might mean that every commit is ancestor and descendant of 
itself. 
I've also checked git merge-base --is-ancestor and found it returns "true" 
for same commit passed twice as argument.

This is formal although not so evident detail, and IMO it changes meaning 
of some git commands/options.

Does anybody have any thoughts on this?

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