+ {&rest numbers} => sum
number---a number.
sum---a number.
Returns the sum of numbers, performing any necessary type conversions in the process. If no numbers are supplied, 0 is returned.
(+) => 0 (+ 1) => 1 (+ 31/100 69/100) => 1 (+ 1/5 0.8) => 1.0
Might signal type-error if some argument is not a number. Might signal arithmetic-error.
section Numeric Operations, section Rational Computations, section Floating-point Computations, section Complex Computations
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