davidvgus/homework — comment on commit db78b20b4c0843f05edb60bbbde9df66407f2ab4
File: convert_challenge.rb line 25
By kotp:

I would do the absolute zero limit and leave the ceiling to whatever it could be. For all units.

Convert all units to K and check if it is below 0K and then convert them out to the target value if appropriate, or report an error.