function sqrtf( x ) {
	return addon( x );
}
Computes the principal square root of a single-precision floating-point number.

@private
@param {number} x - input value
@returns {number} principal square root

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

v = sqrtf( 9.0 );
// returns 3.0

v = sqrtf( 0.0 );
// returns 0.0

v = sqrtf( -4.0 );
// returns NaN

v = sqrtf( NaN );
// returns NaN