function absf( x ) {
	return addon( x );
}
Computes the absolute value of a single-precision floating-point number `x`.

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

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

@example
var v = absf( 2.0 );
// returns 2.0

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

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

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