Open questions and to-dos

[mwpastore]

Questions

• Should Enumerable#piecewise return an Enumerator if no block is given, a la #select, etc.?
• Should Enumerator#piecewise return a lazy enumerator if self is already lazy (eliminating the need for Enumerator::Lazy#piecewise)?
• Should #piecewise be broken into two separate methods, a la #with_index and #each_with_index?
• Should Enumerable#piecewise pass its args to #each or Enumerator#piecewise?

TODO

• Add more/better examples
• Test argument passing to Enumerable#each and Enumerator(::Lazy)#new