docs: function copyOptions( options ) {
  		var props = [
  				'objectMode',
  				'highWaterMark',
  				'encoding'
  			],
  			copy = {},
  			prop;
  
  		for ( var i = 0; i < props.length; i++ ) {
  			prop = props[ i ];
  			if ( options.hasOwnProperty( prop ) ) {
  				copy[ prop ] = options[ prop ];
  			}
  		}
  		return copy;
  	}