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Problem: MessagePack fixstr format supports string lengths 0-31, but mpack_str() only used fixstr for lengths < 20. Strings of 20-31 bytes were incorrectly encoded as str8 (2-byte header) instead of fixstr (1-byte header). Solution: Change the condition from `len < 20` to `len < 32` to match the MessagePack specification. This fix affects message timing which exposed a pre-existing race condition in the channels_spec PTY test. The test now uses a helper function to accumulate partial PTY reads, making it more robust. Fixes #32784