Issues

• Package semver gate accepts optional parameter additions that break positional calls

  bug
  jaseci-labs/jac#10078 · Filter by author christianwilkins opened on Oct 13, 2026

• A dependency compiled for its symbols never persists an interface, so it is recompiled from source on every run

  jaseci-labs/jac#10067 · Filter by author kugesan1105 opened on Oct 13, 2026

• Jac Scale: a deploy after a one-line edit recompiles every module, although precompile could reuse the rest

  jaseci-labs/jac#10057 · Filter by author MusabMahmoodh opened on Oct 13, 2026
  1

• jac check performance: roadmap toward pyrefly-class throughput

  TypeCheck
  jaseci-labs/jac#10053 · Filter by author marsninja opened on Oct 13, 2026

• Serve: env_bool reads every value except four false words as true, so JAC_SERVE_DOCS="" or JAC_SERVE_GRAPH=disabled turns the feature on, while the [serve.*] table overlay rejects the same input

  jaseci-labs/jac#10051 · Filter by author MusabMahmoodh opened on Oct 13, 2026
  1

• scale: first HTML request stalls ~90 s on v0.34.4-v0.34.23 (page routes compiled on the request thread); no per-route head for client apps

  jaseci-labs/jac#10049 · Filter by author SahanUday opened on Oct 13, 2026

• Postgres bytes parameters silently change bytea values or fail with encoding errors

  bug
  jaseci-labs/jac#10047 · Filter by author christianwilkins opened on Oct 13, 2026

• Client HMR: each .jac edit full-reloads the page; unchanged runtime JS is rewritten

  bugClient
  jaseci-labs/jac#10045 · Filter by author udithishanka opened on Oct 13, 2026
  1

• byLLM: an on_compaction hook that shrinks the message list in place is silently discarded

  jaseci-labs/jac#10043 · Filter by author SahanUday opened on Oct 13, 2026

• Postgres parameter rewriting changes dollar quoted literals and misreads SQL comments

  bug
  jaseci-labs/jac#10028 · Filter by author christianwilkins opened on Oct 12, 2026

• jac install selects prereleases enabled only by rejected solver candidates

  bug
  jaseci-labs/jac#10015 · Filter by author christianwilkins opened on Oct 12, 2026

• byLLM: expose applied compactions to the caller (compaction StreamEvent)

  jaseci-labs/jac#10012 · Filter by author SahanUday opened on Oct 12, 2026
  

• byLLM: empty or failed final answers on Luna, Opus 5.5 and Sonnet 5

  jaseci-labs/jac#10010 · Filter by author MalithaPrabhashana opened on Oct 12, 2026

• byLLM: a retried final-answer stream keeps the text from the failed attempt

  jaseci-labs/jac#10007 · Filter by author MalithaPrabhashana opened on Oct 12, 2026

• Native incremental build re-analyses a stale unit's whole import closure from source

  jaseci-labs/jac#10005 · Filter by author marsninja opened on Oct 12, 2026

• Epic: one artifact router — use the built artifact or the floor, build only on request (clean break)

  jaseci-labs/jac#10000 · Filter by author marsninja opened on Oct 11, 2026

• native: struct.unpack with a format chosen at run time does not lower

  jaseci-labs/jac#9999 · Filter by author marsninja opened on Oct 11, 2026

• jac test crashes without a diagnostic when a native test calls a function an imported module demoted

  jaseci-labs/jac#9998 · Filter by author marsninja opened on Oct 11, 2026
  1

• EPIC: JacPython — port all of CPython's runtime to Jac

  jaseci-labs/jac#9994 · Filter by author chess10kp opened on Oct 11, 2026
  2

• JacPython object ports: close the remaining call-path gaps (closure_cell 1.17, ctl_list_index 1.30, enumerate 1.11 vs C)

  jaseci-labs/jac#9993 · Filter by author chess10kp opened on Oct 11, 2026

• checker: a flow lookup refuses the reference inside x = f(x) when a later statement is asked about first (false E1099, order-dependent)

  jaseci-labs/jac#9992 · Filter by author marsninja opened on Oct 11, 2026

• Jac Serve: anchors with list or dict fields are re-serialized at each of a request's three commits, so routes that load them pay the full scan three times

  jaseci-labs/jac#9980 · Filter by author MusabMahmoodh opened on Oct 11, 2026

• checker: a for-loop target that rebinds a variable to another type is not reported, and the native binary corrupts memory

  jaseci-labs/jac#9972 · Filter by author marsninja opened on Oct 10, 2026

• py side: a module that only declares C records drops them, so importers fail with ImportError

  jaseci-labs/jac#9970 · Filter by author marsninja opened on Oct 10, 2026

• Amplify on Jac vs Next.js: performance gaps

  jaseci-labs/jac#9968 · Filter by author MusabMahmoodh opened on Oct 10, 2026