Cross-axis fill sizing reaches distribution before the current line size
is initialized. Count eligible items from the minimum fallback, as the
update loop already does. Use zero increments when every item is at its
maximum, avoiding division by zero.
Add portable controls for minimum initialization, redistribution at a cap
and fully saturated items. All three raise arithmetic errors before the
fix and pass afterward. Generated vertical-fill histories cover the full
layout and component pipeline too.
Validate the final continuation on common JVM (2004 tests / 32919
assertions), common JS (1940 / 31522), frontend (1745 / 13569), backend
(1793 / 9007) and exporter (16 / 40). All four modules pass lint and format.
All six generated properties pass 40 programs at seed 712 in both runtimes.
Golden data is unchanged.
The final continuation benchmark passes with no regression flags. Lower
quantile ratios against Phase 1e: main 10/100/1000 0.51/0.58/0.57, three
levels 0.57, chain 0.53, library 0.57, many shapes 0.45, variant switch 0.66.
Machine/JVM differences make these rough comparisons; baseline unchanged.
AI-assisted-by: gpt-6
96a4c76ab6