Support for iterable-agnostic functions

[sjadema]

Nice package! So annoying that PHP doesn't provide this logic in their standard libs. However, even with these functions i still have to type check before calling them: $iterable instanceof \Traversable ? iterator_xxx : array_xxx. Would be epic if agnostic variants where introduced (e.g. iterable_map, iterable_keys, iterable_flip. Then you could just pas an iterable and the function would do the rest. I think they should return what they where fed so array if is_array($iterable), otherwise \Traversable.

[dgoosens]

just came across this very same issue with collections...
Doctrine Collections or Knapsack Collections use IteratorAggregate, not Iterator... so that is not working out well...
They all boil down to \iterable though

[doekenorg]

I'm thinking of using iterable instead of Iterator. But the functions will always return an Iterator. I feel like this makes the most sense for this package. Just piping stuff through to the array equivalent doesn't feel right..