FA-15865 / Floating-point arithmetic / Member archive

NaN quietness is inferred from payload parity · case 05

NaN quietness is inferred from payload parity.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

Decode an unsigned 64-bit IEEE binary64 encoding into sign, kind, unbiased exponent, integer significand, quiet flag and payload. Nonfinite fields use null; zero and subnormal exponents are -1022.

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
signaling payload	`[1, "nan", null, null, true, 5]`	`[1, "nan", null, null, false, 5]`	Failed

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