fladd(fl1, @rest ...)
flsub(fl1, @rest ...)
flmult(fl1, @rest ...)
fldiv(fl1, fl2)
flmod(fl1, fl2)
Return the result of performing the arithmetic operation on fl1, ... (or fl1 and fl2).
Raise an error if an argument is not a flonum.
fladd(12.2, 34.1)
// 46.3
fldiv(10., 3.)
// 3.3333333333333335
flmod(10., 3.)
// 1.