Promise epoch-2026.7

[djabi]

Promise epoch-2026.7 is the current stable epoch.

Two language features, a new supported platform, and a batch of memory-safety and correctness fixes.

• Large integer types — i128/u128, i256/u256, i512/u512 are first-class: full arithmetic, division/modulo, .rodata constants, and use as map values. See docs/large-integers.md.
• Failable goroutines — go! { } spawns a coroutine whose body may fail, yielding a linear failable_task[T]; <-t surfaces the error at the await site. (language-design §17.2.1)
• linux-arm64 is now release-gated, alongside linux-amd64, darwin-arm64, and windows-amd64.
• Memory-safety and correctness fixes — iterator and optional-map double-frees, structural-interface boxing heap corruption, and unsuffixed integer-literal range checks (u8 a = 300; is now rejected), among others.

Full notes and downloads: https://github.com/promise-language/promise/releases/tag/epoch-2026.7
Install: https://github.com/promise-language/promise/blob/main/docs/installing.md

Promise is pre-1.0 and moves one epoch at a time; only the current epoch gets fixes. Usage questions go to Q&A, proposals to Ideas.