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Things I figured out:
- 'row' in render-screen doesn't perfectly track cursor-row in screen
- proximal cause was forgetting to add left:number to stop-printing
- trying to print to screen outside bounds was silently succeeding and
corrupting simulated memory
- if we silently ignore prints outside bounds things are fine
But why are prints outside screen bounds working? We should be accessing
screen data using 'index', and that's checking its bounds.
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I keep forgetting about it. Until, that is, I run gprof. Even if I think
I need a memory profile, a cpu profile is a pretty good proxy.
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But still no difference in either memory footprint or in running time.
This will teach me -- for the umpteenth time -- to optimize before
measuring.
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Now we can reclaim allocated space. But the API's suspect. I still want
to provide some sort of tree of allocations. For now we'll use this only
to reclaim default-spaces. That's next.
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