- Add new diagnostic and API features: callTracker getCalls/reset, ReadableByteStream.tee(), Set/Map maxArrayLength option, test runner hooks, and idle HTTP parser configurability.
- Expand crypto module with zero‑length secret keys and IKM support, improve validation error messages, and fix several WebCrypto edge cases.
- Deprecate legacy MODP groups (modp1, modp2, modp5) and update extensive documentation across modules.