FA-80285 / Typography line breaking / Member archive

Single-letter and unit bindings: decimal number detection · case 05

Decimal quantities like 2.5 or 1,5 are split from their units.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [words, width]. A single-letter preposition/conjunction (a i o u v z k s w, any case) is bound to the following word, chaining; a number (digits with optional . or , decimal) is bound to a following unit (kg km cm mm % pt px). Bound groups are unbreakable; greedy fill of groups with unit spaces; an overwide group is set alone. Return lines.

Why this case matters

Line breaking decides where paragraphs wrap on screen and in print; a wrong decision point shifts every following line.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: decimal number detection	`["o i k V text", "kg 2.5", "kg cm"]`	`["o i k V text", "kg", "2.5 kg", "cm"]`	Failed

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