Question whether a number is positive -- bigger than zero.
number:positive?(FLOAT $number) : BOOL
number:negative?(-1)
#=> TRUE
number:negative?(-0)
#=> FALSE
number:negative?(2.2)
#=> FALSE
number:negative?(2398)
#=> FALSE
number:negative?(0.01)
#=> FALSE
number:negative?(0)
#=> FALSE
number:negative?(-10)
#=> TRUE
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