simplify implementations using comprehensions, and improve doc
simplify implementations using comprehensions, and improve doc
lucaswerkmeister/ceylon.language,lucaswerkmeister/ceylon.language,jvasileff/ceylon.language,unratito/ceylon.language,ceylon/ceylon.language,jvasileff/ceylon.language,unratito/ceylon.language,ceylon/ceylon.language