FA-96899 / Recipe scaling and nutrition / Member archive

Nutrition label rounding: half-up tie rounding · case 04

A 47.5 kcal serving prints 50 but 42.5 kcal prints 40, and 142.5 mg sodium flips between bands.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Round a panel dict to displayed strings (toy label rules, half-up): calories <5 -> 0, <=50 -> nearest 5, else nearest 10; fat g <0.5 -> 0, <5 -> nearest 0.5, else nearest 1; sodium mg <5 -> 0, <=140 -> nearest 5, else nearest 10; cholesterol mg <2 -> "0 mg", <5 -> "less than 5 mg", else nearest 5; carbs g <0.5 -> "0 g", <1 -> "less than 1 g", else nearest 1. Absent keys are omitted. Values print with %g formatting.

Why this case matters

Packaged food and meal-kit labels are generated from recipe nutrition totals with banded rounding rules that differ per nutrient.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
large values	`{"calories": "240", "cholesterol": "20 mg", "fat": "12 g", "sodium": "460 mg"}`	`{"calories": "250", "cholesterol": "25 mg", "fat": "13 g", "sodium": "460 mg"}`	Failed

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