BigNum.forceArg(x, [true|false])
Force argument x to be passed into nzLua as a BigNum value, even
if the value would otherwise be passed as a normal nzLua number.
This function must be called in the initialize method of the UDX. The
forceArg function is supported for a UDF or UDTF but not for a
UDA.Example
function initialize()
BigNum.forceArg(1,true)
BigNum.forceArg(3,true)
end