Primitive Types

Type	Literal syntax	Example
Int	plain integer	42
Long	integer with L suffix	100L
Double	decimal point, no suffix	3.14
Decimal	decimal point with d suffix	9.99d
Bool	true / false	true
String	double-quoted	"hello"
Id	no literal. Runtime only	(from DML)
Void	the keyword Void	Void

Void is a real first-class value. A function that only produces side effects declares : Void and ends with Void as its trailing expression.

fn log(
    message: String,
): Void {
    debug message
    Void
}

No implicit widening between numeric types. Both sides of an arithmetic expression must be the same type.