function cbrtf( x ) {
	return float64ToFloat32( cbrt( float64ToFloat32( x ) ) );
}
Computes the cube root of a single-precision floating-point number.

@param {number} x - input value
@returns {number} cube root

@example
var v = cbrtf( 64.0 );
// returns 4.0

@example
var v = cbrtf( 27.0 );
// returns 3.0

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

@example
var v = cbrtf( -9.0 );
// returns ~-2.08

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