> Historically environment variables cannot be deleted, only made empty.
> It's not a good idea to check for existence, check for it being
> non-empty instead.
Do not tell it me. There is an example: if PYTHONDUMPREFS variable is set for
debug build of python, no matter whether or not it is empty, python will dump
references.
There is a way to delete variables on most system. I would expect vim to
support deleting them. Also what for there is working `exists('$VAR')` if it is
supposed to be `empty('$VAR')`? The statement in the doc (“could also be done
by comparing with an empty string”) is not true, there is a difference between
existing and empty in exists() output.
> Note that Vim will consider a non-existing environment variable to be
> empty, it doesn't give an error for ":let s = $ASDFASDF".
Usually environment variables are for interprocess communication between parent
and children processes. Vim being a child process of the vim is very uncommon.
And `exists('$ASDFASDF')` does not tell 0 if environment variable exists, but
is empty.
All languages I use except VimL allow deleting environment variables:
os.environ behaves like real dict in python, same for perl $ENV, shells have
`unset`.
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