FA-11583 / Filesystem semantics / Member archive

Truncation rewinds an open file position · case 03

Truncation rewinds an open file position.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Deterministic in-memory filesystem model. Resize text to nonnegative size, filling growth with null characters, and return [new text, unchanged nonnegative offset].

Why this case matters

An offline semantic experiment for file API clients; it models only the stated operations, not a complete operating system.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
shrink below current offset	`["ab", 0]`	`["ab", 9]`	Failed

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