Checks if a variable's base type is numeric.
IsNumber ( variable )
A number can be an integer/whole number or a fractional/floating-point.
If the variable is a numeric value represented as a string, then IsNumber() will return 0.
See language datatypes for a detailed description.
IsArray, IsBinary, IsBool, IsFloat, IsHWnd, IsInt, IsMap, IsPtr, IsString