Issues

• 0.22.0 regression: tests/unit/test_struct.py::TestClassVar::test_wrong_classvar is breaking assertions in CPython

  msgspec/msgspec#1221 · Filter by author mgorny opened on Sep 30, 2026

• Type argument of a parametrized generic TypedDict base is ignored when subclassed

  msgspec/msgspec#1191 · Filter by author Siyet opened on Sep 17, 2026

• Support prepared TypeInfo for msgspec.convert in a form of msgspec.Converter(typ)

  enhancement
  msgspec/msgspec#1178 · Filter by author sobolevn opened on Sep 13, 2026
  

• PowerPC support

  msgspec/msgspec#1161 · Filter by author kasium opened on Aug 19, 2026
  2

• Present All Validation Errors as Structured Output

  msgspec/msgspec#1158 · Filter by author eliasdejong opened on Aug 15, 2026
  2

• Allow Color = tuple[float, float, float] | tuple[float, float, float, float]

  msgspec/msgspec#1137 · Filter by author HansBrende opened on Aug 9, 2026
  3

• Automatically omit keys when decoding to TOML

  msgspec/msgspec#1131 · Filter by author hongquan opened on Jul 27, 2026

• [benchmark] Request for call-path / fairness review (GLD.SerializerBenchmark)

  msgspec/msgspec#1125 · Filter by author leo-gan opened on Jul 17, 2026

• Adding the TOML version to the optional dependencies

  msgspec/msgspec#1120 · Filter by author chirizxc opened on Jul 12, 2026
  2

• CI allows merging commits that fail workflows

  msgspec/msgspec#1115 · Filter by author sobolevn opened on Jul 3, 2026

• Docs: Google SEO: Redirect jcristharif.com/msgspec/*

  msgspec/msgspec#1111 · Filter by author Ra2-IFV opened on Jul 2, 2026

• CodSpeed: test_pickle_load[arm] is bimodal and randomly flags unrelated PRs

  msgspec/msgspec#1110 · Filter by author Siyet opened on Jul 2, 2026
  3

• Support a default variant for tagged unions when the tag field is missing

  msgspec/msgspec#1098 · Filter by author ofek opened on Jun 21, 2026
  4

• msgspec tests crash with PYTHON_LAZY_IMPORTS=all on 3.15

  bug
  msgspec/msgspec#1095 · Filter by author sobolevn opened on Jun 21, 2026
  2

  

• Deprecate top-level re-exports

  msgspec/msgspec#1090 · Filter by author provinzkraut opened on Jun 19, 2026
  9

• Struct field overridden as ClassVar in subclass produces unexpected behavior

  msgspec/msgspec#1086 · Filter by author LmeSzinc opened on Jun 18, 2026
  6

• Support decoding JSON with comments and trailing commas

  msgspec/msgspec#1078 · Filter by author Vizonex opened on Jun 16, 2026
  5

• Redirect old docs to new docs

  msgspec/msgspec#1061 · Filter by author umarbutler opened on Jun 13, 2026
  1

• Port to new concurrent.interpreters support in cpython 3.14+

  msgspec/msgspec#1026 · Filter by author goodboy opened on Apr 24, 2026
  3

• Validation errors for Literal types incorrectly say 'enum value'

  msgspec/msgspec#1009 · Filter by author Siyet opened on Apr 10, 2026

• Support several dataclasses in a union

  msgspec/msgspec#982 · Filter by author sobolevn opened on Feb 28, 2026
  9

• msgspec.defstruct is not compatible with msgspec.StructMeta

  msgspec/msgspec#974 · Filter by author kunesj opened on Jan 30, 2026

• Cannot decode MSGPACK into Struct with bytes | str

  msgspec/msgspec#973 · Filter by author ypnos opened on Jan 26, 2026
  1

• Allow annotation of tag fields

  msgspec/msgspec#972 · Filter by author umarbutler opened on Jan 26, 2026

• Evolving a Struct into a Union

  msgspec/msgspec#968 · Filter by author evelyno-rigetti opened on Jan 7, 2026
  2