Hmmm.......that is pretty nice, but I think agree with @ivarne that those are valuable variable names to take and pretty trivial to define on your own. The constructors for periods used to be `years(1); months(1)`, but I actually changed them to be more in line with the thinking in #1470 (i.e. always use Proper-case names for type constructors). While this technically isn't *constructing* the Period types, I think it'd still be better to leave as is in Base.