- multi_coalesce/batch: the ordering contract now states what Flush
actually guarantees -- per-flow DATA order -- and names the two
shapes later data may legally overtake (pure ACKs by design, and
unparseable in-flow shapes as an accepted tradeoff).
- validVnetHdr claimed DATA_VALID makes the stack skip L4 checksum
verification; the tun write path ignores that bit entirely. What the
header buys is the absence of NEEDS_CSUM.
- tun_darwin Write said "only valid for single threaded use"; it is
concurrency-safe and concurrent callers exist.
- udp_coalesce eviction comment said "Seal it" but never sets sealed.
- recordCapability: note the gauges are process-global while the state
is per-socket (last writer wins).
- drop a stale tunReadBufSize reference.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014ugV2edVqoz3tBvq9J6yWp
JackDoan