FA-17419 / Time representation / Member archive

Timestamp sign marker misses the minimum code or negative subsecond instants · case 04

The decoded time state disagrees with the explicit regression oracle for negative.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Decode four unsigned bytes: signed 16-bit big-endian seconds and unsigned 16-bit fractional microticks, 1000 per second. Fraction >=1000 is invalid. Return validity and, only for valid input, exact total microticks, signed decimal timestamp with three fractional digits, and whole-second coordinate after a one-microtick increment. Negative display uses magnitude decomposition.

Why this case matters

Clock transfer and timestamp consumers require preserved coordinate, phase, validity and elapsed-time semantics.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 3	`[true, -32767001, "32767.001", -32767]`	`[true, -32767001, "-32767.001", -32767]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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