Why are they framing it as a proposal if it's done? (if this comes across as Socratic, it is unintentional, I genuinely don't understand why the author would be posting a proposal when it is done)
EDIT: My naive reading of https://github.com/swiftwasm/swift/issues is there's a lot, lot, to go. TL;DR: open from 2021, stdio FILE not available in WASILibc. Long version, filed in 2020 and open: "Pointers needed on WASILibc", "Make the toolchain work without Xcode installed", "Enable libdispatch or provide stubs for it", 2022 "canImport(Dispatch) is wrongly truthy on WASI target", "wasm lacks signal support" (broke/regression in Sept. 2024, still open)