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A reliable way to test if two values are exactly equal. For floating point values, this will consider NaN to be (===) to NaN.

An approximate equality comparison operator. For RealFloat values, (~==) x y = (x == y) || (abs (x - y) < epsilon) || (eqRel delta x y) || (isNaN x && isNaN y). For Complex numbers, the if the real and imaginary parts are not approximately equal, the polar forms are compared, instead.