[krodak]

Overview

Follow-up to #768, which normalized wasm pointer offsets with >>> 0 in the generated BridgeJS glue. It missed one site: swift_js_push_typed_array, added by #745, which copies a Swift numeric array out of linear memory into a JS array.

Once memory grows past 2 GiB, ptr arrives as a negative i32. ArrayBuffer.slice treats a negative index as an offset from the end of the buffer, so the copy reads the wrong bytes and JS silently gets wrong values. This PR normalizes ptr before the slice.

Before:

const copy = memory.buffer.slice(ptr, ptr + byteLen);

After:

const start = ptr >>> 0;
const copy = memory.buffer.slice(start, start + byteLen);

[kateinoigakukun]

LGTM, thanks! This was the last pointer offset in the generated glue that wasn't normalized.

[krodak]

Yeah, missed tytanowe initially 😅