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From: hiro <23hiro@gmail.com>
Date: Fri, 11 Jan 2019 20:01:57 +0100
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Subject: Re: [9front] bug in sed
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X-Bullshit: mobile rich-client database 

some seem to think it's obvious after reading this, but i don't:

                       g    Global.  Substitute for all non-
                            overlapping instances of the regular
                            expression rather than just the first one.

i would say it's not clear whether one should ^ would ever be part of
an "overlap".
i totally expected that ^ and $ would get special treatment here, even
if it's not mentioned.