code: function getprototypeat(index) {
  		var prev = buffer.substr(0, index);
  		var indx = prev.length;
  		while(--indx && prev[indx].match(CLASSNAME)) {}
  		return prev.substring(indx + 1) + '.prototype.';
  	}
docs: TODO: zero-index singularity?
  @param {number} index
  @returns {string}