A base trait for Show3T and Unshow3, declares the common properties of name1 - 3 and opt1 - 3.
3rd parameter name.
The optional default value for parameter 3.
1st parameter name.
2nd parameter name.
Number of parameter constituents of this class.
The optional default value for parameter 1.
The optional default value for parameter 2.
Sequence of the names of parameter constituents of this class.
The RSON type of T. This the only data that a ShowT instance requires, that can't be implemented through delegation to an object of type Show.