FA-15903 / Floating-point arithmetic / Member archive

Leaving zero increments its old signed encoding · case 03

Leaving zero increments its old signed encoding.

Member previewVariant 3 · 3 implementations · 12 checks per implementation

Case contract

Return the binary64 bit pattern one representable step from x toward y, or canonical quiet NaN for NaN operands. Equal operands return the exact bits of y, including zero sign.

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
zero negative	`1`	`9223372036854775809`	Failed

MEMBER ARCHIVE

The complete case is available to members.

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

Member access is invitation-based. Sign in with your invited account to inspect the sources.