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graph-revs-log-for-path: Optimize label name lookup

vlorentz requested to merge path-parts into master
  • .label_name() needs to bisect through a large file
  • UTF-8 decoding takes a linear time in the file name size
  • comparing strings is slower (also linear time) than comparing integers

This requires swh-graph >= 6.7.0, as it fixed a major soundness bug in label_name_id.

cc @anlambert

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