EitherOrBoth: Add or and or_else methods to simplify getting default values#593

bors[bot] merged 1 commit intorust-itertools:masterrust-itertools/itertools:masterfrom

carl-anders:either-or-both-adding-or-and-or-elsecarl-anders/itertools:either-or-both-adding-or-and-or-elseCopy head branch name to clipboard