metric(0.0) raised ValueError: math domain error


intword(-1000) = '-1000'; expected '-1.0 thousand'


intcomma(0.0, 0) = '0.0'; expected no decimal point


naturalsize(2.0) = '2.0 Bytes'; expected no decimal in 'X Bytes'


naturaldelta(+1s) = 'a second' but naturaldelta(-1s) = 'a day'


naturaldelta(0.01, ms) = '0 milliseconds'; expected '10 milliseconds'