From 511e699feeaeb5b7ce5882b62d424af614a157cf Mon Sep 17 00:00:00 2001
From: cdemirer <41021322+cdemirer@users.noreply.github.com>
Date: Sun, 2 Jan 2022 05:43:52 +0800
Subject: [PATCH] Fix unexpected Packed Array copying when parameter is typed

---
 modules/gdscript/gdscript_vm.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/gdscript/gdscript_vm.cpp b/modules/gdscript/gdscript_vm.cpp
index be9e5df2b00..7e087b842fa 100644
--- a/modules/gdscript/gdscript_vm.cpp
+++ b/modules/gdscript/gdscript_vm.cpp
@@ -488,7 +488,12 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 				memnew_placement(&stack[i + 3], Variant(*p_args[i]));
 				continue;
 			}
-
+			// If types already match, don't call Variant::construct(). Constructors of some types
+			// (e.g. packed arrays) do copies, whereas they pass by reference when inside a Variant.
+			if (argument_types[i].is_type(*p_args[i], false)) {
+				memnew_placement(&stack[i + 3], Variant(*p_args[i]));
+				continue;
+			}
 			if (!argument_types[i].is_type(*p_args[i], true)) {
 				r_err.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
 				r_err.argument = i;