Gee Functional iterators

[Martin DeMello <martindemello gmail com>]

I asked about functional methods (map, filter, fold, etc) on the vala
mailing list, and Didier pointed me to
https://bugzilla.gnome.org/show_bug.cgi?id=589968

I'm new to vala in general; could someone explain why adding methods
to, say, Iterable would break the API?

(Also, if we're looking for a good set of methods to implement, Ruby's
Enumerable module and the Haskell prelude would be a good source of
inspiration)

martin