diff --git a/src/lib/liblittle_endian_heap.js b/src/lib/liblittle_endian_heap.js
index 1f97eb6530010..8a2ba67c8af2a 100644
--- a/src/lib/liblittle_endian_heap.js
+++ b/src/lib/liblittle_endian_heap.js
@@ -109,11 +109,11 @@ function LE_HEAP_UPDATE() {
     const res = order(Atomics.sub(heap, offset, order(value)));
     return heap.unsigned ? heap.unsigned(res) : res;
   },
-  $LE_ATOMICS_WAIT: (heap, offset, value, timeout) => {
+  $LE_ATOMICS_WAIT: (heap, offset, value, timeout = Infinity) => {
     const order = LE_ATOMICS_NATIVE_BYTE_ORDER[heap.BYTES_PER_ELEMENT - 1];
     return Atomics.wait(heap, offset, order(value), timeout);
   },
-  $LE_ATOMICS_WAITASYNC: (heap, offset, value, timeout) => {
+  $LE_ATOMICS_WAITASYNC: (heap, offset, value, timeout = Infinity) => {
     const order = LE_ATOMICS_NATIVE_BYTE_ORDER[heap.BYTES_PER_ELEMENT - 1];
     return Atomics.waitAsync(heap, offset, order(value), timeout);
   },
diff --git a/tools/acorn-optimizer.mjs b/tools/acorn-optimizer.mjs
index fdc2306649a26..11a9d2c401ce1 100755
--- a/tools/acorn-optimizer.mjs
+++ b/tools/acorn-optimizer.mjs
@@ -1219,9 +1219,10 @@ function isGrowHEAPAccess(node) {
   if (
     node.type !== 'MemberExpression' ||
     !node.computed || // notice a[X] but not a.X
-    node.object.type !== 'ParenthesizedExpression')
+    (node.object.type !== 'ParenthesizedExpression' && node.object.type !== 'SequenceExpression')
+  )
     return false;
-  const obj = node.object.expression;
+  const obj = node.object.type === 'ParenthesizedExpression' ? node.object.expression : node.object;
   return (
     obj.type === 'SequenceExpression' &&
     obj.expressions.length === 2 &&