FA-18355 / Time representation / Member archive

Epoch fraction uses signed magnitude or microsecond modulus · case 05

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

Member previewVariant 5 · 3 implementations · 11 checks per implementation

Case contract

A clock uses signed 16-bit seconds relative to configurable epoch E and fractional nanoseconds. Source absolute total nanoseconds is exact integer. Convert to canonical seconds/remainder relative to E, mark representability, and serialize biased unsigned seconds word only if in range. Provide saturation coordinate, loss amount, earliest/latest representable total and exact reconstruction.

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 2	`[32767, 1, true, 9999999999, 0, [-32758000000000, 32777999999999], 9000000001]`	`[32767, 999999999, true, 9999999999, 0, [-32758000000000, 32777999999999], 9999999999]`	Failed

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

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