Stream: bugs

Topic: Another in-place mutation bug, for nested List.update

view this post on Zulip Matthieu Pizenberg (Aug 18 2026 at 14:31):

Recorded the perf bug here: https://github.com/roc-lang/roc/issues/10849

Basically List.update on an inner nested list triggers copies instead of in-place mutations.

Last updated: Sep 24 2026 at 15:59 UTC