Since version 0.9
Syntax:
const <varname> = <number>
The CONST
directive defines a constant. The constant can be subsequently used as a regular variable, except that it is read-only.
Constants of any numeric types (bytes, integers or floats) may be defined. The number must be a numeric literal (no expression is allowed here).
Example:
const BORDER = $d020 const WHITE! = 1 poke BORDER, WHITE! const PI% = 3.1415926