[Android][core] Reduce the memory footprint of calling function from the native module (#37080)

Author: lukmccall

packages/expo-modules-core/CHANGELOG.md

@@ -20,7 +20,8 @@
 
 - Improved `@expo/ui/swift-ui-primitives` integrations. ([#36937](https://github.com/expo/expo/pull/36937) by [@kudo](https://github.com/kudo))
 - [iOS] Use dynamic type for AsyncFunction result conversion ([#36986](https://github.com/expo/expo/pull/36986) by [@jakex7](https://github.com/jakex7))
-- [Android] Improve time to retrieve the Expo module.
+- [Android] Improve time to retrieve the Expo module. ([#37082](https://github.com/expo/expo/pull/37082) by [@lukmccall](https://github.com/lukmccall))
+- [Android] Reduce the memory footprint of calling function from the native module. ([#37080](https://github.com/expo/expo/pull/37080) by [@lukmccall](https://github.com/lukmccall))
 
 ## 2.3.13 — 2025-05-08
 

packages/expo-modules-core/android/src/main/java/expo/modules/kotlin/functions/AnyFunction.kt

@@ -73,7 +73,7 @@ abstract class AnyFunction(
       throw InvalidArgsNumberException(args.size(), desiredArgsTypes.size, requiredArgumentsCount)
     }
 
-    val finalArgs = Array<Any?>(desiredArgsTypes.size) { null }
+    val finalArgs = arrayOfNulls<Any?>(desiredArgsTypes.size)
     val argIterator = args.iterator()
     for (index in 0 until args.size()) {
       val desiredType = desiredArgsTypes[index]
@@ -100,10 +100,13 @@ abstract class AnyFunction(
       throw InvalidArgsNumberException(args.size, desiredArgsTypes.size, requiredArgumentsCount)
     }
 
-    val finalArgs = Array<Any?>(desiredArgsTypes.size) { null }
-    val argIterator = args.iterator()
+    val finalArgs = if (desiredArgsTypes.size == args.size) {
+      args
+    } else {
+      arrayOfNulls<Any?>(desiredArgsTypes.size)
+    }
     for (index in args.indices) {
-      val element = argIterator.next()
+      val element = args[index]
       val desiredType = desiredArgsTypes[index]
       exceptionDecorator({ cause ->
         ArgumentCastException(desiredType.kType, index, element?.javaClass.toString(), cause)