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Johnathan Corgan
da5d23ccb7
Adopted ephemeral UDP transports created by adopt_established_traversal() default to UdpConfig::default() (MTU=1280, IPv6 minimum) when the bootstrap runtime hands a socket without an explicit transport_config override. This is by design: NAT-traversal middlebox MTU is unpredictable and the IPv6 minimum is the only value guaranteed by spec to survive arbitrary paths. Add an explanatory comment at the call site so future readers find the rationale without spelunking through ISSUE-2026-0013, and so any future change to the inheritance behavior is a deliberate decision rather than an accidental refactor. No behavior change.