This is one of those questions that I should have asked years ago, but never got
around to it: Does inserting duplicate #include files into a scene cause any
hidden problems? Or extra memory usage? Not that I've noticed anything so far,
I'm just curious (especially regarding macros, and/or defined functions that may
need to be undefined first before being re-#included.)

This would be a 'typical' example...

#include "math.inc"
#include "transforms.inc"
#include "shapes.inc"  // this also has math.inc and transforms.inc

Over the years, I've seen a few newsgroup posts that essentially say: Don't do
this. But aside from 'bad coding practice', is is harmful? I would assume that
using all #locals in the #included files (vs. #declares) would eliminate any
problems(?)

It would be nice to have a definitive answer, though. (I've never seen an
explanation or caveat in the documentation, regarding this.)

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