[Mimedefang] $CWD in filter_tick()

[imacat]

Dear all,

    Hi.  This is imacat from Taiwan.  I was writing some code to
clean-up dead working directories periodically with filter_tick().  I
found that in filter_tick(), $CWD is SPOOLDIR.  But this is not
documented in mimedefang-filter(5).  Can I depend on the fact that $CWD
is SPOOLDIR in filter_tick()?  Or should I use $Features{'Path:SPOOLDIR'}?
How should I access SPOOLDIR most properly?

--
Best regards,
imacat ^_*' <imacat at mail.imacat.idv.tw>
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