RFCs

Proposals, resolved and open. Maintainer material — a proposal describes what the language might do, which is not the same as what it does. For current behaviour, read ../reference/.

• parallel-for-width.md — accepted and built 2026-08-13. The parallel(W) for width slot; what shipped is recorded at the end of the file.
• value-lifetime-regions.md — study, closed with a recommendation not to build. Whether a region lifetime can follow a value instead of a scope; the answer is to build nothing yet (§6 states the single condition that would change that).
• or-return-mapping.md — decided 2026-09-25. Error-mapping or_return was measured across 42 sites and set aside in favour of or_else, which shipped in 0.8.6. The body is the proposal as measured, kept for the reasoning.
• limited-references-spike.md — decided: stored references rejected. The spike behind subscripts, the one limited-reference construct that fits the arena model; graphs stay as index pools.
• ffi-threading-design-review.md — review, mostly shipped. FFI and threading, reviewed together; the header lists which recommendations landed and which stay open.