Looking at the code, it seems that the last reply is the one returned now -- the name is a
bit misleading if it expects the previous reply. I think it needs a dedicated field in the
structure if one needs to get access to previous reply code. I would also suggest to add
an alias like $T(prev_reply) for more suggestive name and obsolete $T_reply_last over the
time, or let the one like it is now and add $T(prev_reply) for prev reply code.
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