Use proper fixed format for parallel type checking IPC #20565
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
hauntsaninja
approved these changes
Jan 11, 2026
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This is another small follow-up for #20280
As promised I am switching from an ad-hoc "binary JSON" format for IPC to a proper fixed format. The performance win is likely negligible, but it looks better and can be "statically typed". Note that since we don't have any backwards compatibility requirements nor need for messages to be decoded by a generic reader, I am using a simpler, more compact serialization format that incremental cache.