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Piecewise inverse calibration chooses segments by concentration · case 04

Piecewise inverse calibration chooses segments by concentration.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Knots are strictly increasing concentration and signal integer pairs. Return exact Fraction concentration for an in-range signal; otherwise None. At least two knots.

Why this case matters

A deterministic synthetic laboratory reporting model isolates a software metadata contract; it is not a clinical procedure.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
second segment midpoint	`"16"`	`"12"`	Failed

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