System.Number - Manhunter07/MFL GitHub Wiki
Declaration
type Number = \built-in\
Description
The Number type in the System package represents the a constraint for numeric values. Allowed values are any integer and fractional numbers, including the special values of NaN and Inf. Numbers are used for quantities, counting and mathematic calculations.
If you need a type that only accepts either positive or negative numbers, consider using Positive and Nagative types.
If you need a type that only accepts integers, consider using either the integer, the rangeint or the sizeint type constructor.
Operator compatibility
When used uppon numeric operands, the operators +, -, /, %, and ^ return numeric values. Anything returned by them is considered a value supported by this type. The ? regardless of its operand types returns values from within -1 to 1 and can therefore safely be used to construct the argument for a Number-typed parameter.