GObject.ULong
GObject.ULong represents the gulong type in the GObject type system. You can pass this class object to methods taking a GObject.Type.
A gulong value is an integer numeric value whose limits are platform and architecture dependent, although it is guaranteed to be between guint and a guint64.
Note that because JS represents numbers in the double-precision floating point format, which only has 52 significant bits, the full range of a gulong may not be available.
Creating a new object with new GObject.ULong returns a Number object with value 0.
Calling GObject.ULong(arg) will coerce the argument to a number.