function diracDeltaf( x ) {
	return addon( x );
}
Evaluates the Dirac delta function for a single-precision floating-point number.

@private
@param {number} x - input value
@returns {number} function value

@example
var v = diracDeltaf( 0.0 );
// returns Infinity

@example
var v = diracDeltaf( 3.14 );
// returns 0.0

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