The Fabl datatype double implements xsd:double.
The operators +,-,*,/,==,<,<=,>, have their usual meanings.Additional functions:
double abs(double x)
double sqrt(double x)
int trunc(double x)
double cos(double x)
double sin(double x)
double tan(double x)
double acos(double x)
double asin(double x)
double atan(double x)
double atan2(double x,double y)
double max(double x,double y)
double min(double x,double y)
The trigonometric operators assume radian angular units. The constant pi is defined.