defmspec questions



Hi all.  Had a few questions about the why of Maxima's guts.  For some
expressions (e.g. $tellsimp) the definition is made not with defun or
defmfun but defmspec, which is a macro in maxmac.lisp.  It seems to be
assigning mfexpr* to a property, but it is not immediately apparent
what this is doing.  Do any of the original authors remember what this
is all about? 

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