Cannot Tween the region_rect of a Sprite2D

[acedogblast]

Godot version: 3.1.2

OS/device including version: Linux x86_64 bit

Issue description: Cannot Tween the region_rect of a Sprite using either interpolate_method() or interpolateproperty()

Steps to reproduce: Create a Sprite and Tween node. Add script to root node:

extends Node2D
func _ready():
        $Tween.interpolate_property($Sprite, "region_rect", $Sprite.region_rect, Rect2(0,0,0,0),5.0 , Tween.TRANS_LINEAR, Tween.EASE_IN_OUT, 0.0)
	$Tween.start()
	yield($Tween, "tween_all_completed")
	pass

Minimal reproduction project:
project

[volzhs]

E 0:00:00:0445   Invalid param type, except(int/real/vector2/vector/matrix/matrix32/quat/aabb/transform/color)
  <C Source>     scene/animation/tween.cpp:1004 @ _calc_delta_val()
  <Stack Trace>  Node2D.gd:4 @ _ready()

for further information, Tween.interpolate_property seems not to support for Rect2

[Jedi18]

Can I be assigned this issue to add support for Rect2 for interpolate_property?

[volzhs]

go ahead 👍