FA-80268 / Typography line breaking / Member archive

Single-letter and unit bindings: single-letter case folding · case 03

Capitalised single-letter words at sentence start dangle at line ends.

Member previewVariant 3 · 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: single-letter case folding	`["a \u0159\u00e1dek", "text V", "i V", "i i o sazba", "km Praze"]`	`["a \u0159\u00e1dek", "text", "V i V i i o sazba", "km Praze"]`	Failed

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