Vectors admittedMessageIdDuplicates carry [invalid,valid], [valid,invalid], [valid,valid]. Decoders that see the
duplicate (C#, Rust) must refuse all three; map-collapsing decoders (Python, TS, Kotlin) judge the last key.
Python, TS, Kotlin and Rust already behave as declared; C# fails: it accepted [valid,valid].
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Failing before the fix: C# 1 (duplicate messageId, second is U+200B), TypeScript 1 (a + lone surrogate),
Kotlin 1 (a document payload string with a lone surrogate no longer decodes). Python and Rust already pass
the new vectors. The range probes read the generated write-admitted-message-id-ranges.json and pass on the
correct tables; they exist to fail when any range is deleted or narrowed.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Raw compare. .NET Unicode categories for L/N, an embedded Default_Ignorable range table (Unicode 16.0).
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Pins Heimdall's rule: a write_admitted messageId needs a Unicode letter or number and no
Default_Ignorable_Code_Point, compared raw. Shared vectors plus a runner test in TS, Python,
Kotlin, C# and Rust. No decoder changed; the refuse vectors fail.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
