FA-16899 / Floating-point arithmetic / Member archive

Decimal quantization ignores the specified exponent range · case 04

Decimal quantization ignores the specified exponent range.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Quantize a decimal text to 10**exponent using a fresh precision-limited decimal context, half-even rounding, Emin=-9 and Emax=9. All traps are disabled; return result string and raised flag names. The coefficient precision includes trailing zeros imposed by the target quantum.

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
subnormal exact	`["1E-10", []]`	`["1E-10", ["Subnormal"]]`	Failed

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