fails:Time.at passed Numeric returns a subclass instance on a Time subclass
fails:Time.at passed Time returns a subclass instance
fails:Time.at passed [Integer, Numeric] returns a Time object representing the given number of seconds and Float microseconds since 1970-01-01 00:00:00 UTC
fails(travis):Time.at passed Numeric returns a non-UTC Time
fails(travis):Time.at passed Time returns a non-UTC time if the argument is non-UTC
