function kernelSin( x, y ) {
	return addon( x, y );
}
Computes the sine on \\( \approx \[-\pi/4, \pi/4] \\) (except on \\(-0\\)), where \\( \pi/4 \approx 0.7854 \\).

@private
@param {number} x - input value (in radians, assumed to be bounded by `~pi/4` in magnitude)
@param {number} y - tail of `x`
@returns {number} sine

@example
var v = kernelSin( 0.0, 0.0 );
// returns ~0.0

@example
var v = kernelSin( 3.141592653589793/6.0, 0.0 );
// returns ~0.5

@example
var v = kernelSin( 0.619, 9.279e-18 );
// returns ~0.58

@example
var v = kernelSin( NaN, 0.0 );
// returns NaN

@example
var v = kernelSin( 3.0, NaN );
// returns NaN

@example
var v = kernelSin( NaN, NaN );
// returns NaN