Issues

• Audit callback iteration order in HashMap::map and other map transformations

  moonbitlang/core#4357 · Filter by author bobzhang opened on Oct 9, 2026

• [BUG] Float::to_json emits NaN/Infinity as numbers, producing invalid JSON that @json.parse rejects

  moonbitlang/core#4354 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] quickcheck splitmix: mix_gamma can return an even gamma, and mix64 deviates from the reference

  moonbitlang/core#4353 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] atan2 and acos ports drop two fdlibm lines (m &= 1, SET_LOW_WORD), losing accuracy and diverging from js

  moonbitlang/core#4352 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] @math.hypot / hypotf exceed 1 ulp and miss exact results (hypot(99, 20) != 101)

  moonbitlang/core#4351 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] Double::compare / Float::compare return 0 for NaN, so sort does not sort

  moonbitlang/core#4350 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] Float::from_int64 / from_uint64 round twice on the js backend

  moonbitlang/core#4349 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] Integer division and remainder by zero do not panic on native and on js --release

  moonbitlang/core#4348 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] @math.acoshf returns ~6.93e35 for x >= 4096 and non-NaN values for -4096 < x <= -2

  moonbitlang/core#4347 · Filter by author KCN-judu opened on Oct 9, 2026

• [BUG] BigInt::from_string truncates long decimal strings on wasm-gc

  moonbitlang/core#4345 · Filter by author KCN-judu opened on Oct 8, 2026
  1

• debug: expose read-only inspection of Repr

  moonbitlang/core#4334 · Filter by author DamianReeves opened on Sep 29, 2026

• quickcheck: improvements from a 17-module, 662-property field report

  moonbitlang/core#4332 · Filter by author bobzhang opened on Sep 29, 2026

• Policy for mutating a collection from its own callback (for .. in, each, retain, get_or_init) before 1.0

  moonbitlang/core#4326 · Filter by author bobzhang opened on Sep 27, 2026

• Deprecate String::view / StringView::view (can produce invalid UTF-16 views)

  moonbitlang/core#4306 · Filter by author bobzhang opened on Sep 26, 2026

• @json.parse: duplicate keys are silently merged, and float lexemes such as 1.0 are lost

  moonbitlang/core#4292 · Filter by author bobzhang opened on Sep 26, 2026

• Pre-1.0 API consistency review (all packages)

  moonbitlang/core#4272 · Filter by author bobzhang opened on Sep 24, 2026
  8

• perf: reuse stored hashes in Set/HashSet union, intersection and difference

  moonbitlang/core#4262 · Filter by author bobzhang opened on Sep 23, 2026
  1

• Hash collections: API consistency gaps between Map, HashMap, Set and HashSet

  moonbitlang/core#4256 · Filter by author bobzhang opened on Sep 23, 2026

• Array: clear and release backing storage without a placeholder

  feature request
  moonbitlang/core#4205 · Filter by author Yu-zh opened on Sep 4, 2026

• Rethink about the comparison (lexical vs fast comparison)

  feature request
  moonbitlang/core#4121 · Filter by author bobzhang opened on Aug 21, 2026

• js backend: lower %bytes.unsafe_{read,write}_uint64_{le,be} to DataView get/setBigUint64 (12-18x)

  enhancementin progress
  moonbitlang/core#4098 · Filter by author bobzhang opened on Aug 19, 2026
  

• json: parser aborts on strings containing lone surrogates combined with escapes

  moonbitlang/core#4049 · Filter by author bobzhang opened on Aug 14, 2026
  1

• RFC: A standard database-access interface (Driver seam) for MoonBit

  moonbitlang/core#3953 · Filter by author Lfan-ke opened on Jul 28, 2026

• #locals does not propagate through calls to #locals-annotated callees

  moonbitlang/core#3832 · Filter by author bobzhang opened on Jul 17, 2026

• bytes/ and string/ regex engines share ~365 lines of byte-identical files

  moonbitlang/core#3828 · Filter by author bobzhang opened on Jul 16, 2026
  1