Allow Addrinfo objects to be shared among Ractors. Addrinfo objects are already immutable, so I think it's safe for us to tag them as RUBY_TYPED_FROZEN_SHAREABLE shareable too.
Socket.tcp_with_fast_fallback
rb_ary_new3
BasicSocket
rb_io_blocking_region
Socket::ResolutionError
heap-use-after-free
free_fast_fallback_getaddrinfo_entry
Socket.tcp_fast_fallback=
IO#timeout
rsock_connect