fix: Fix invalid signed/unsigned comparison in ReadableStream#read (#1742)

Author: Willem Wyndham

.github/workflows/test.yml

@@ -139,7 +139,7 @@ jobs:
       env:
         ASC_FEATURES: mutable-globals,threads,reference-types,bigint-integration,gc
       run: |
-        npm run test:compiler rt/flags features/js-bigint-integration features/reference-types features/threads
+        npm run test:compiler rt/flags features/js-bigint-integration features/reference-types features/threads std-wasi/process std-wasi/crypto
   test-runtimes:
     name: "Runtimes"
     runs-on: ubuntu-latest

std/assembly/process.ts

@@ -133,7 +133,7 @@ abstract class WritableStream extends Stream {
 abstract class ReadableStream extends Stream {
   read(buffer: ArrayBuffer, offset: isize = 0): i32 {
     var end = <usize>buffer.byteLength;
-    if (offset < 0 || offset > end) {
+    if (offset < 0 || <usize>offset > end) {
       throw new Error(E_INDEXOUTOFRANGE);
     }
     store<usize>(iobuf, changetype<usize>(buffer) + offset);