[Bug 272120] touch(1) -r modifies file's birthtime

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272120

--- Comment #6 from Simon Tettmar <simon.tettmar@gmail.com> ---
(In reply to Alexey Dokuchaev from comment #5)

> I don't quite see why these timestamps should be interconnected at all.

Yes, I take your point and am somewhat torn on this subject. 

I have a small addition to the man page that I was going to submit as a PR.
This simply notes this behaviour and I think would be non-controversial and
helpful if added.

But beyond that I think this behaviour probably should be addressed. I am
trying to think if anything would rely upon the birth adjusting to match an
earlier modification date ( which seems unlikely ).

Going forwards, I think I might submit the PR for the small documentation
change and then investigate further what is required to allow the modification
date to be changed ( without necessarily adjusting the birth date ).

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