[Exim] transport, message_size_limit and lookup

Hello,

I just tried to set per-user-and-domain message size limit in
transport, and it failed with:

LOG: 0 PANIC DIE
Exim configuration error
integer expected for message_size_limit in line 381

Does that mean, that I cannot do something like:

message_size_limit = \
${lookup{${local_part}} partial-lsearch*{VIRT_DIR/limits/${domain}}{$value}{8M}}

because file lookups for that option are not implemented? I would be
very happy to see it in exim -- some of my users need it badly.

best regards,
Jubal

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