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- net.createServer with a provably-non-object argument, connect option bags (literal, computed-key, and runtime-record spellings) walking Node's Socket-constructor order — the objectMode trio's ERR_INVALID_ARG_VALUE, validatePort's ERR_SOCKET_BAD_PORT, host's string and autoSelectFamily's boolean contracts — and the autoSelectFamilyAttemptTimeout range ladder (validated and then inert, the single-dial simplification's sibling); setDefaultAutoSelectFamilyAttemptTimeout validates from 1 and keeps Node's sub-10ms floor. - listen's and dgram.createSocket's options.signal answer validateAbortSignal's ERR_INVALID_ARG_TYPE for provably-non-AbortSignal values; plausible signals keep the fence (abort-driven close has no lowering yet). - dgram.Socket.send replicates Node's signature shuffle over DOM arguments: slice type/bounds contracts (ERR_BUFFER_OUT_OF_BOUNDS over Buffers, subarrays, DataViews, and strings), the buffer-list per-element contract with the list as the Received tail, the unconnected port ladder with the specific-type tail and trailing period, the null/undefined-only address gate, and the connected-state ERR_SOCKET_DGRAM_IS_CONNECTED arms — a fully-validated unconnected single-payload send RUNS; callback/list/connected forms meet the post-validation fence. The dgram state errors now carry Node's ERR_SOCKET_* codes, and dgram bind/connect/close callbacks accept checked-dynamic wrappers through the dynCheck boundary. - Corpus 2579 (net, both backends) and 2580 (dgram) pin the ladders byte-identically vs Node; order-parity baselines re-recorded.