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Output stopping: Streaming buffer emits partial stop prefixes too early · case 03

Streaming buffer emits partial stop prefixes too early.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

For a stream suffix and stop strings, emit the longest prefix that cannot be part of any stop string prefix; retain the remaining suffix. Empty stop list emits everything.

Why this case matters

A deterministic output-control model isolates one finish or streaming boundary from any particular runtime.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
partial marker held	`["hello\u003cst"]`	`["hello", "\u003cst"]`	Failed

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