[exim] def:acl var with strict_acl_vars=true

Logically speaking should exim have a problem with this:

${if def:acl_m_pref_msg_maxsize}


when acl_m_pref_msg_maxsize has not been defined and
strict_acl_vars=true???


if I'm bothering to check if the variable is defined aren't I working
within the spirit of what strict_acl_vars is trying to enforce and
shouldn't get a error?


Regards,
Brian