anchor.diff:      
       REPL.prototype.onNavigateHistory = function(direction) {
           this.previousCommandOffset += direction;
  -        var previousCommands = JSON.parse(localStorage.getItem("previousCommands"));
  +        var previousCommands = JSON.parse(localStorage.getItem("better_errors_previous_commands"));
           
           if(this.previousCommandOffset < 0) {
               this.previousCommandOffset = -1;
  
positive.code:     REPL.prototype.onEnterKey = function() {
          var text = this.getInput();
          if(text != "" && text !== undefined) {
              var previousCommands = JSON.parse(localStorage.getItem("previousCommands"));
              this.previousCommandOffset = previousCommands.push(text);
              if(previousCommands.length > 100) {
                previousCommands.splice(0, 1);
              }
              localStorage.setItem("previousCommands", JSON.stringify(previousCommands));
          }
          this.setInput("");
          this.sendInput(text);
  
negative.code:     function REPL(index) {
          this.index = index;
          
          var previousCommands = JSON.parse(localStorage.getItem("better_errors_previous_commands"));
          if(previousCommands === null) {
            localStorage.setItem("better_errors_previous_commands", JSON.stringify([]));
            previousCommands = [];
          }
  
  