Issues

• regex parser: report errors at the start of the offending construct

  moonbitlang/core#4424 · Filter by author bobzhang opened on Oct 20, 2026

• builtin type mbti is a bit weird

  moonbitlang/core#4422 · Filter by author bobzhang opened on Oct 19, 2026

• Proposal: IEEE float operators and Hash; total_compare with NaNs first and equal signed zeros

  moonbitlang/core#4408 · Filter by author bobzhang opened on Oct 16, 2026

• [BUG] moon fmt rewrites a long x => x lambda into x => { x }, which the compiler reads as a record literal

  moonbitlang/core#4383 · Filter by author KCN-judu opened on Oct 13, 2026
  

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

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

• 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

• 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

• strconv: mantissa digit parsing reads one character at a time

  moonbitlang/core#3825 · Filter by author bobzhang opened on Jul 16, 2026

• sorted_set: union defensively copies both trees and recounts the result size

  moonbitlang/core#3824 · Filter by author bobzhang opened on Jul 16, 2026

• argparse: add clap-style args_conflicts_with_subcommands and subcommand_negates_reqs for a top-level default action alongside subcommands

  moonbitlang/core#3769 · Filter by author bobzhang opened on Jul 1, 2026

• ICE: Key_not_found during codegen for or-pattern binding .. rest across bits sub-patterns

  moonbitlang/core#3699 · Filter by author bobzhang opened on Jun 24, 2026
  1

  

• stringbuilder sugar

  moonbitlang/core#3696 · Filter by author bobzhang opened on Jun 21, 2026

• Type-alias re-export does not export the same-named constructor: @facade.T(...) fails while @facade.T::T(...) works

  moonbitlang/core#3695 · Filter by author bobzhang opened on Jun 19, 2026
  1

• optimize temporary array view pattern match

  moonbitlang/core#3680 · Filter by author bobzhang opened on Jun 11, 2026