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Travis Cross fe71b660c5 Fix comment on is_horizontal_whitespace
The comment on `is_horizontal_whitespace` says "This is
Pattern_White_Space", but the function matches only tab (U+0009) and
space (U+0020) -- two of the eleven `Pattern_White_Space` code points.
This has been the case since Rust PR 146106, which narrowed the set
from full `Pattern_White_Space` to the horizontal subset.

The correct characterization is that this is the horizontal space
subset of `Pattern_White_Space`, as categorized by UAX 31,
Section 4.1, which partitions `Pattern_White_Space` into line endings,
ignorable format controls, and horizontal space.
2026-03-04 06:10:42 +00:00
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