If possible, init will guess the module path from import comments
(see 'go help importpath') or from version control configuration.
that pattern (see 'go help packages' for a description of package
Works also with windows who manage multiple sources(see examples).
It is up to the developer that creates the derived class to override `GetImmutableTuple()`. Without using reflection (see other answer), I feel this is the least of all evils.
