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Just curious though, what does comp_includes_z=>1; do?
I had a look at the Module, and you seem to have z_min() and the z_max() functions. Probably that would help.
I make decisions, and my brain carries them out
My brain makes the decisions, and I observe them (if I'm lucky)
I make some decisions, and my brain makes others
My spouse makes decisions and I and my brain carry them out
I wrote a program to relieve me and my brain from the burden of decision-making
The black-helicopter people project the decisions into my brain and then I do as ordered
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