- Default precision is now 3.
(Instead of "3 months 25 days 17 hours 46 minutes 40 seconds", it'll
say "3 months 25 days 17 hours". You can still set the precision to
`Infinity` if you actually prefer that.)
- Now displays "forever" for Infinity or overflow durations
- No longer skips blank precision levels
(Shows "3 hours 0 minutes 10 seconds" instead of
"3 hours 10 seconds")
