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remove some UB when dealing with non-ASCII data

Matthew Fernandez requested to merge smattr/graphviz:smattr/81b79ea4-3aa3-4cb6-a25d-72d354185a04 into main

Following on from #2502 (closed), this series deals with a few more spotted cases of insufficient non-ASCII robustness. The scenarios by which you actually run into trouble here are pretty esoteric (non-ASCII UTF-8 characters in unexpected places combined with a ctype.h implementation that misbehaves when given non-ASCII characters), but nevertheless these are technically Undefined Behavior.

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