FA-16687 / Floating-point arithmetic / Member archive

Same-sign interpolation adds endpoints before weighting · case 02

Same-sign interpolation adds endpoints before weighting.

Member previewVariant 2 · 3 implementations · 10 checks per implementation

Case contract

Interpolate finite a and b at t in [0,1], preserving endpoints and avoiding overflow in a difference or an endpoint sum. Return domain marker outside the interval. Finite results are rendered to eleven significant decimal digits; modeled domain violations and arithmetic errors are explicit strings.

Why this case matters

An offline floating representation model isolates a reproducible arithmetic fault.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
same extremes	`"1.5e+308"`	`"1.25e+308"`	Failed

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