FA-96865 / Recipe scaling and nutrition / Member archive

Servings scaler: eighth-cup rounding · case 05

0.19 cup prints as 1/8 instead of 1/4 and small amounts collapse to pinch too early.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Scale [name, qty, unit, kind] rows from base to target servings. Factor f=target/base (both must be positive, else an error string). Seasoning rows scale by 1+(f-1)*3/4 (damped); other rows by f. Unit "each" rounds half-up to an integer with a floor of 1. Other units round half-up to the nearest 1/8 and print as reduced kitchen fractions ("1 1/2", "3/4", "2"); a zero result prints "pinch".

Why this case matters

Home and commercial recipe scalers must keep countable items whole and print measurable fractions cooks can actually portion.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: eighth-cup rounding	`[["flour", "1/4", "cup"], ["pepper", "pinch", "tsp"], ["cumin", "1/8", "tsp"], ["egg", "1", "each"]]`	`[["flour", "1/4", "cup"], ["pepper", "pinch", "tsp"], ["cumin", "1/4", "tsp"], ["egg", "1", "each"]]`	Failed

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