Why can't I assign Array to Array[Resource]?

Typed arrays are a distinct type. Use Array[Resource]([...]) to construct a typed array, or call typed_array.assign(untyped_array) to copy with element type checking.

What about converting back to untyped?

Implicit on read in most contexts. Or untyped: Array = typed.duplicate() works since duplicate() returns a regular Array.

They enforce per-element type at insert time, surface errors earlier, and produce better autocomplete for downstream code.

Fix: Godot Typed Array Won't Accept Untyped

Quick answer: Construct via Array[Resource]([...]) or copy via typed.assign(untyped).

Function returns Array with mixed Resource elements. You assign to var items: Array[Resource] and Godot complains about type mismatch.

The Fix

# Construct a typed array directly
var items: Array[Resource] = Array([res1, res2], TYPE_OBJECT, "Resource", null)

# Or simpler 4.3+:
var items: Array[Resource]
items.assign(get_untyped_array())   # type-checks each element

# Or use literal initializer:
var items: Array[Resource] = [res1, res2]   # literals work directly

assign validates each element against the typed array’s element type, raising on mismatch. Literal initializers infer type when unambiguous.

Verifying

Pass mixed Array; assign() copies; typed methods work after. Pass an Array containing a non-Resource; assign() throws.

“assign for type-checked copy. Literal for direct init.”

Related Issues

For C# List property edits, see List property. For C# Export flags, see flags.

assign() copies typed. Errors loud.