140's 5, line breaking (UAX #14, Unicode 16.0), written in aup with no new opcode (aup's examples/linebreak.aup, the properties as data: 2,787 ranges from the UCD 16.0 Vega's text is frozen at, built by Vega's text/unicode.py, loaded once): every line of LineBreakTest.txt (16,672) and 2,000 random lines (their boundaries as linebreak.py, the Python reference, which passes the test whole, works them out) right on the three paths, the paths' outputs the same; module_specs in make check: the ranges and the lines kept in tests/specs/linebreak (derived from the UCD, the Unicode License v3's notice), run by pure-run --views; bars: written, no workaround (three frictions: hex literals always i64, number no let's name, a let's list one a line), 176 lines against Python's 99, 6,920 ns a code point against Vega's C 34.7 (199x), pure Python 2,523 (Pure 2.7x slower), 1,774 instructions a code point (setup 260, the ranges' binary search 360, decide about 1,150 a boundary); the decisions before 8 (box layout: Taffy can be fetched by cargo, a subset to choose first; as a handler) and 10 (a one-shot timer is a core primitive one spec needs: noted, not made); the suite table's row 5; CHECKPOINT's direction row

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+# Line breaking's properties and lines (UAX #14, Unicode 16.0)
+
+`ranges.bin` and `lines.bin` are what `research/experiments/044-specs/linebreak_check.py` writes (its first argument)
+from the Unicode Character Database 16.0.0 that Vega's text is frozen at (`vega/build/upstream/ucd-16.0.0`, read by
+Vega's `text/unicode.py`): Copyright © 1991-2024 Unicode, Inc., under the Unicode License v3
+(https://www.unicode.org/license.txt), which lets data derived from it be copied with this notice.
+
+- `ranges.bin`: the properties' ranges, 2,787 rows of six little-endian binary64s (start, class after LB1 in
+  `linebreak.aup`'s numbering, initial quotation, final quotation, East Asian, pictographic and unassigned), as the app's
+  load message takes them.
+- `lines.bin`: every line of `auxiliary/LineBreakTest.txt` (16,672), then 2,000 random lines (code points drawn from each
+  class, their boundaries as `linebreak.py` works them out). Each is a u32 count, its u32 code points and count + 1
+  bytes, 1 where a line may break.
+
+`tests/check.py`'s `module_specs` loads the ranges into aup's `examples/linebreak.aup` and gives it every line, on Pure's
+three paths.