Cannot implicitly convert one number type to another

[gincwang]

Currently, when you assign numbers of different types (e.g. double = double + integer), we get back an error Attempting to assign incorrect value to statically-typed variable.

Under the hood Roku automatically does the type conversion for us, so this should be a valid operation.
https://developer.roku.com/docs/references/brightscript/language/expressions-variables-types.md#type-conversion-promotion