`nil` not listed as valid input for vector:set

[michaeljosephpurdy]

Documentation says to call vector:set with nil if you don't want the underlying x or y to be changed.

However, doing that ends up triggering LSP diagnostic message:

Diagnostics:
1. Cannot assign `nil` to parameter `number`.
   - `nil` cannot match `number`
   - Type `nil` cannot match `number` [param-type-mismatch]