Function is_same 

pub fn is_same(a: &Variant, b: &Variant) -> bool

Returns true, for value types, if a and b share the same value. Returns true, for reference types, if the references of a and b are the same.

# Vector2 is a value type
var vec2_a = Vector2(0, 0)
var vec2_b = Vector2(0, 0)
var vec2_c = Vector2(1, 1)
is_same(vec2_a, vec2_a)  # true
is_same(vec2_a, vec2_b)  # true
is_same(vec2_a, vec2_c)  # false

# Array is a reference type
var arr_a = []
var arr_b = []
is_same(arr_a, arr_a)  # true
is_same(arr_a, arr_b)  # false

These are Variant value types: null, bool, int, float, String, StringName, Vector2, Vector2i, Vector3, Vector3i, Vector4, Vector4i, Rect2, Rect2i, Transform2D, Transform3D, Plane, Quaternion, AABB, Basis, Projection, Color, NodePath, RID, Callable and Signal.

These are Variant reference types: Object, Dictionary, Array, PackedByteArray, PackedInt32Array, PackedInt64Array, PackedFloat32Array, PackedFloat64Array, PackedStringArray, PackedVector2Array, PackedVector3Array, PackedVector4Array, and PackedColorArray.