v3.0.4

Fixed

• Cancellation arriving immediately after synchronous or empty-body preparation
  is now observed before payload hashing starts.

Documentation

• Corrected the 3.0.2 and 3.0.3 notes to distinguish the 3.0.2 Uint8Array
  copy-strategy regression from the broader view hardening first shipped in
  3.0.3. Releases before 3.0.3 could snapshot out-of-bounds non-Uint8 typed
  arrays as empty bodies or allow non-Uint8 typed-array and DataView subclass
  accessors to substitute different bytes.