Proposal: filter_map, flat_map, findfirst_map, inspect, fuse

[yatra9]

It would be better if we have some major iterator functions which Rust has.
Rust std::iter::Iterator

Especially, I'm eager for filter_map and flat_map.
(I personally think that filter_map and flat_map should better be in Base.Iterators...)

Enumerable module in ruby 2.7 will have flat_map and filter_map.

[kmsquire]

That sounds good. Care to create a PR?

[yatra9]

OK. I'will try.