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Replace made-up use of "topographical" ordering with professional, high-quality academic use of "topological" ordering
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Authored by epriestley on Jun 20 2019, 7:05 PM.
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Details

Summary

Ref T13325. See PHI1271. The word "topographical" is misused in a couple of APIs here when we mean "topological".

We also have a function which produces a "topological" ordering of a graph which may contain cycles, which isn't a real thing and can't really have a good name, but this is now "rough topological ordering".

Test Plan

Ran unit tests, grepped for topograph.

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rPHU libphutil
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