https://bugs.exim.org/show_bug.cgi?id=3024

--- Comment #6 from Andreas Metzler <[email protected]> ---
(In reply to Jeremy Harris from comment #5)
[...]
> ${reduce...} is documented to use $value; we could only change it by
> adding optional behaviour, which also means syntax.  At least until
> someone designs Exim version 5, we're stuck with it.

It is not that clear cut. - Some uses of reduce broke, because some other parts
of exim were enhanced/extended. So we already broke reduce for some users.
Still I think you right, breaking $value for all users would be worse than the
status-quo.

How about marking reduce deprecated and adding e.g. reduce2 which differs from
reduce only in using e.g. $red_value instead of $value as temporary variable?
This seems to be simpler and more robust to future changes than looking at all 
expansion operators and extending all of them that change $value (either now at
some unknown point in the future) to have an option to not do this.

cu Andreas

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