[exim] parameters in transport not going through string expa…

Heya,

A newsgroup post made me a bit confused about parameters not going
through string expansion in transports.

One such parameter is "mode" in the "appendfile" transport. Basically,
one can't do something like:

foo_transport:
    mode = ${if something {${eval:0660}}{${eval:0600}}}

Creating separate transports with literal octal modes is required. That
made me a bit confused, as there is no way to influence "expansionless"
params.

Any hints?

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