Ruby Issue Tracking System

09/22/2026

02:20 PM Ruby Bug #22341 (Open): Class#superclass can crash the interpreter in debug build

While implementing this in ZJIT, @nirvdrum reported, and I investigated, a potential interpreter crash:
module M; end
C = Class.allocate
C.include M
C.superclass
In a debug build, this crashes:
plum% ./bui... tekknolagi (Maxwell Bernstein)

09/04/2026

04:41 PM Ruby Misc #22249: DevMeeting-2026-09-10

* [Misc #22272] Propose Kevin Menard (@nirvdrum) as a core committer (tekknolagi)
* I am proposing we make Kevin Menard, a long-time and frequent contributor, a committer.
* This will also help ZJIT: it would be nice if he could merg... tekknolagi (Maxwell Bernstein)

08/27/2026

03:11 PM Ruby Misc #22272 (Open): Propose Kevin Menard (@nirvdrum) as a core committer

## Proposal
I'd like to propose Kevin Menard (@nirvdrum) as a committer. He started full-time work on ZJIT about a year ago and has been doing excellent work since. For example, he wrote the function inliner, which is the single bigge... tekknolagi (Maxwell Bernstein)

08/10/2026

06:42 PM Ruby Revision 8cc69700 (git): ZJIT: Don't double dereference

Co-authored-by: Alan Wu <XrXr@users.noreply.github.com> tekknolagi (Maxwell Bernstein)

07/02/2026

06:21 AM Ruby Revision 33e58bca (git): ZJIT: Clean up confusing comment

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com> tekknolagi (Maxwell Bernstein)

04/08/2026

02:34 PM Ruby Feature #21982: Add `Decimal` as a core numeric class

Oh, gotcha. Yeah we would not be able to optimize C code. Maybe one day it will motivate a pure Ruby impl but today is not that day. tekknolagi (Maxwell Bernstein)

04/07/2026

06:57 PM Ruby Feature #21695: Optimizing Ruby performance with Ruby itself instead of Rust

I am curious about this gem and will give it a read over if you post the link here. tekknolagi (Maxwell Bernstein)

06:48 PM Ruby Feature #21982: Add `Decimal` as a core numeric class

I am hopeful that in the medium-long term, ZJIT will be able to "see through" and even elide general Ruby object allocations when possible. We have some more cleanup and feature work before that becomes possible (for example, a function ... tekknolagi (Maxwell Bernstein)

03/21/2026

12:11 AM Ruby Revision e69e6333 (git): ZJIT: Clean up getivar specialization code (#16475)

Add reusable helpers for getting fields, making C calls, etc. De-indent a bunch of stuff. tekknolagi (Maxwell Bernstein)

03/20/2026

11:35 PM Ruby Revision f55d9e19 (git): ZJIT: Add codegen for ArrayMax (#16411)

Implements codegen for `ArrayMax` (opt_newarray_max) by calling the `rb_vm_opt_newarray_max` VM helper, following the same pattern as `ArrayHash` and `ArrayInclude`. tekknolagi (Maxwell Bernstein)