0.2.0

Highlights

• Loss recovery — Full RFC 9002 loss detection and congestion control via the newzoomies.recoverymodule
• ACK generation — Per-space packet number tracking with ACK frame emission
• Stream reassembly — Ordered delivery through wiredStreamclass
• Congestion control — NewReno (RFC 9002 §7) with cwnd gating in the send path
• Production hardening — Flow control, idle timeout, anti-amplification, CONNECTION_CLOSE, key rotation

Added

Recovery module (zoomies.recovery)

• SentPacket registry and PacketSpaceper-space tracking
• RttEstimatorwith EWMA smoothing (RFC 9002 §5.3)
• Packet-number and time-based loss detection with frame retransmission
• PTO probing with exponential backoff
• Anti-amplification enforcement (3x limit before address validation)
• NewReno congestion controller with cwnd gating

Protocol features

• ACK generation — track received packet numbers per space, emit ACK frames
• Stream reassembly —Streamwired into connection for ordered delivery
• Stream send offset tracking viaStreamSendState.advance()
• HANDSHAKE_DONE frame sent after handshake completes
• CONNECTION_CLOSE frame support
• STOP_SENDING / RESET_STREAM frame handling
• Key update rotation via HKDF "quic ku"
• Variable packet-number length encoding
• Flow control enforcement and idle timeout
• Sans-I/O timer pattern for loss detection callbacks

Performance

• AES-ECB cipher cached onCryptoContext, optimized nonce XOR
• QPACK static table dict for O(1) lookup, bytes-native encode path
• Packet coalescing in_flush_stream_send_queue
• bisect.insortfor stream chunks and crypto ranges
• Prune consumed crypto ranges, bytes-join instead of+=
• Consolidated HKDF into sharedcrypto/_hkdf.pymodule

Testing

• Benchmarks for handshake latency and stream throughput
• Recovery integration tests (packet drops, PTO escalation)
• Interop tests (encrypt/decrypt roundtrip)
• Hypothesis property tests for recovery invariants
• Connection hygiene and hardening test suites

Fixed

• InvalidTagstate corruption bug in crypto processing

Status

• Alpha: full TLS 1.3 handshake, 1-RTT, loss recovery, congestion control
• Sans-I/O design, typed, free-threading ready