Changed

• orjson.dumps() does not serialize dataclasses.dataclass attributes
  that begin with a leading underscore, e.g., _attr. This is because of the
  Python idiom that a leading underscores marks an attribute as "private."
• orjson.dumps() does not serialize dataclasses.dataclass attributes that
  are InitVar or ClassVar whether using __slots__ or not.

Fixed

• orjson.dumps() raises an exception if the object to be serialized
  is not given as a positional argument. orjson.dumps({}) is intended and ok
  while orjson.dumps(obj={}) is an error. This makes it consistent with the
  documentation, help() annotation, and type annotation.
• Fix orphan reference in exception creation that leaks memory until the
  garbage collector runs.

Changed

• Improve serialization performance marginally by using the fastcall/vectorcall
  calling convention on python3.7 and above.
• Reduce build time.

Added

• orjson.dumps() serializes subclasses of str, int, list, and dict.

Changed

• orjson.dumps() serializes dataclasses.dataclass and uuid.UUID
  instances by default. The options OPT_SERIALIZE_DATACLASS and
  OPT_SERIALIZE_UUID can still be specified but have no effect.

Changed

• The source distribution vendors a forked dependency.

Fixed

• Fix integer overflows in debug builds.

Changed

• The source distribution sets the recommended RUSTFLAGS in .cargo/config.

Fixed

• Import numpy only on first use of OPT_SERIALIZE_NUMPY to reduce
  interpreter start time when not used.
• Reduce build time by half.

Fixed

• Fix deserialization raising JSONDecodeError on some valid negative
  floats with large exponents.

Changed

• Improve deserialization performance of floats by about 40%.

Changed

• Serialize enum.Enum objects.
• Minor performance improvements.

Changed

• Publish python3.9 manylinux2014 wheel instead of manylinux1 for x86_64.
• Publish python3.9 manylinux2014 wheel for aarch64.

Fixed

• Fix compilation failure on 32-bit.