fix(msgpack): use fixstr encoding for strings of length 20-31 #36737

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

0 files changed, 0 insertions, 0 deletions