User Exceptions
You can define exceptions other than those automatically captured by the system. This enables you to add new properties and methods specific to your own exception protocol or to override system methods.
As Jade itself uses exception codes with lower numbers (that is, those less than 63,999), you should define error codes for your user-defined exceptions in the range 64000 through Max_Integer (#7FFFFFFF, which equates to 2147483647).
