Issues

• convert raises AttributeError for non-mapping objects implementing __getitem__

  msgspec/msgspec#1308 · Filter by author maldoinc opened on Oct 24, 2026
  2

• Reference leak warning with Struct and deferred annotations on Python 3.14

  msgspec/msgspec#1305 · Filter by author gleb-chipiga opened on Oct 23, 2026

• Support PEP 728 extra_items / closed on TypedDict

  msgspec/msgspec#1304 · Filter by author phiresky opened on Oct 22, 2026

• JSON encodes UTC offsets near +/-24:00 as Z

  msgspec/msgspec#1297 · Filter by author cig13zs opened on Oct 20, 2026

• Decoding wide Structs is much slower with reversed or shuffled fields

  msgspec/msgspec#1289 · Filter by author Siyet opened on Oct 20, 2026

• Investigate SIMD fast paths for long JSON strings

  msgspec/msgspec#1288 · Filter by author Siyet opened on Oct 19, 2026
  1

• Segfault reading decimal_format after a failed Encoder.__init__ re-call

  msgspec/msgspec#1279 · Filter by author digit50 opened on Oct 15, 2026
  4

• Fix Free-Threading support

  enhancement
  msgspec/msgspec#1249 · Filter by author sobolevn opened on Oct 12, 2026
  2

• convert: mapping fields named like mapping methods (keys, get, ...) resolve to the bound method

  msgspec/msgspec#1246 · Filter by author Andarius opened on Oct 11, 2026

• Decoding subnormal numbers is really slow

  msgspec/msgspec#1232 · Filter by author nineteendo opened on Oct 6, 2026
  5

• 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
  4

• [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