function abs2( x ) {
	return x * x;
}
Computes the squared absolute value of a double-precision floating-point number `x`.

@param {number} x - input value
@returns {number} squared absolute value

@example
var v = abs2( -1.0 );
// returns 1.0

@example
var v = abs2( 2.0 );
// returns 4.0

@example
var v = abs2( 0.0 );
// returns 0.0

@example
var v = abs2( -0.0 );
// returns 0.0

@example
var v = abs2( NaN );
// returns NaN