docs: function peek(target, callback) {
  		var mw = core.base();
  		mw.enabled = true;
  		mw.target = target;
  		mw.callback = (callback || function (line /*, mw*/) {
  			return line;
  		});
  		mw.writeln = function (line) {
  			if (mw.enabled && mw.callback) {
  				line = mw.callback(line, mw);
  				if (typeof line === 'string') {
  					mw.target.writeln(line);
  				}
  			}
  		};
  		mw.toString = function () {
  			return '<miniwrite-peek>';
  		};
  		return mw;
  	}