diff --git a/src/types/argument/array.js b/src/types/argument/array.js
index 5a9de11..1051114 100644
--- a/src/types/argument/array.js
+++ b/src/types/argument/array.js
@@ -66,14 +66,10 @@ function getArrayElement(pointer, tag, i) {
   }
 }
 
-export function unboxArray(type, value, length) {
-  const pointer = cast_u64_ptr(new ExtendedDataView(value).getBigUint64());
+export function unboxArray(type, array, length = -1) {
+  if (!array) return null;
 
-  if (!pointer) return null;
-
-  const array = cast_u64_ptr(
-    new ExtendedDataView(deref_buf(pointer, 8)).getBigUint64(),
-  );
+  const pointer = cast_u64_ptr(array);
 
   const paramType = g.type_info.get_param_type(type, 0);
   const paramTag = g.type_info.get_tag(paramType);
@@ -81,18 +77,19 @@ export function unboxArray(type, value, length) {
 
   let buffer;
 
-  if (!array) {
+  // manually get the length of the array
+  if (length === -1) {
+    let i = 0;
+    while (getArrayElement(pointer, paramTag, i) !== 0) i++;
+
+    length = i * getTypeSize(paramTag);
+  }
+
+  if (length <= 0) {
     // empty array, just return an empty TypedArray instead of returning null
     buffer = null;
   } else {
-    if (length === -1) {
-      let i = 0;
-      while (getArrayElement(array, paramTag, i) !== 0) i++;
-
-      length = i * getTypeSize(paramTag);
-    }
-
-    buffer = deref_buf(array, length);
+    buffer = deref_buf(pointer, length);
   }
 
   switch (paramTag) {
diff --git a/src/types/callable.js b/src/types/callable.js
index 2f0206a..e6a9d10 100644
--- a/src/types/callable.js
+++ b/src/types/callable.js
@@ -39,7 +39,7 @@ export function parseCallableArgs(info) {
   const argDetails = [];
   for (let i = 0; i < nArgs; i++) {
     const argInfo = g.callable_info.get_arg(info, i);
-    const arg = { ...createArg(argInfo), index: i };
+    const arg = createArg(argInfo);
     argDetails.push(arg);
     g.base_info.unref(argInfo);
   }
@@ -74,35 +74,28 @@ export function parseCallableArgs(info) {
   };
 
   const parseOutArgs = (outArgs) => {
-    return outArgsDetail
-      .map((arg, index) => {
-        // keep the index for the outArgs
-        return { arg, index };
-      })
-      .filter(({ arg }) => {
-        // lengthArgs are not returned
-        return !(outArgsDetail.some((d) => d.arrLength === arg.index));
-      })
-      .map(({ arg, index }) => {
-        let length = -1;
-
-        // get the value of the length argument
-        if (arg.arrLength !== -1) {
-          const lengthArg = outArgsDetail.findIndex(({ index }) =>
-            arg.arrLength === index
-          );
-          const lengthPointer = outArgs[lengthArg];
-          length = new ExtendedDataView(
-            deref_buf(cast_u64_ptr(lengthPointer), 8),
-          ).getBigUint64();
-        }
-
-        return unboxArgument(
-          arg.type,
-          new BigUint64Array([outArgs[index]]).buffer,
-          length,
-        );
-      });
+    const values = [];
+
+    for (const [index, arg] of outArgsDetail.entries()) {
+      if (outArgsDetail.some((d) => d.arrLength === index)) continue;
+
+      // extract the length of this argument (if it's an array)
+      const lengthArg = outArgsDetail.findIndex(({ index }) =>
+        arg.arrLength === index
+      );
+
+      let length = -1;
+
+      if (lengthArg !== -1) {
+        const lengthPointer = cast_u64_ptr(outArgs[lengthArg]);
+        length = new ExtendedDataView(deref_buf(lengthPointer, 8))
+          .getBigUint64();
+      }
+
+      values.push(unboxArgument(arg.type, outArgs[index], length));
+    }
+
+    return values;
   };
 
   return [parseInArgs, initOutArgs, parseOutArgs];