[Issue 15783] Junk is written into environment variable after assigning null to it

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15783

--- Comment #3 from Roman <freeslave93 at gmail.com> ---
Still issue for 2.073.2

Can we just decide that providing the null means removing environment variable
or setting it to empty string? Better make it behave the same way as on Windows
(not sure what's behavior though).

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