diff --git a/README.md b/README.md
index 6c3862a..03b3ad7 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,7 @@ readlineSync.setPrompt({
   toString: function() {
     return '[' + require('path').basename(process.cwd()) + ']# '; // Get and show current directory.
   }
-})
+});
 ```
 
 ### setPrint
diff --git a/lib/readline-sync.js b/lib/readline-sync.js
index af0884e..be94c6d 100644
--- a/lib/readline-sync.js
+++ b/lib/readline-sync.js
@@ -23,7 +23,7 @@ var
     prompt:         '> ',
     noEchoBack:     false,
     mask:           '*',
-    limit:          '',
+    limit:          [],
     caseSensitive:  false,
     noTrim:         false,
     encoding:       'utf8',
@@ -36,7 +36,7 @@ var
   extHostPath, extHostArgs, tempdir, salt = 0;
 
 /*
-  display:        other (to string)
+  display:        string
   keyIn:          boolean
   noEchoBack:     boolean
   mask:           string
@@ -45,8 +45,8 @@ var
   noTrim:         boolean
   encoding, bufferSize, print
 */
-function _readlineSync(options) {
-  var input = '', displaySave = (options.display += ''),
+function _readlineSync(options) {return options;
+  var input = '', displaySave = options.display,
     silent = !options.display && options.keyIn && options.noEchoBack && !options.mask;
 
   function tryExt() {
@@ -414,7 +414,6 @@ function margeOptions() {
                                 // _readlineSync    defaultOptions
         // string
         case 'mask':                        // *    *
-        case 'limit':                       // *    *
         case 'encoding':                    // *    *
 /* jshint eqnull:true */
           options[optionName] = value != null ? value + '' : '';
@@ -436,9 +435,19 @@ function margeOptions() {
         case 'print':                       // *    *
           options[optionName] = typeof value === 'function' ? value : void 0;
           break;
+        // array
+        case 'limit':                       // *    *     readlineExt
+/* jshint eqnull:true */
+          options[optionName] = value != null ?
+            flattenArray(value, function(value) {
+              return typeof value === 'string' || typeof value === 'number' ||
+                value instanceof RegExp;
+            }) : [];
+/* jshint eqnull:false */
+          break;
         // other
         case 'prompt':                      //      *
-        case 'display':                     // *
+        case 'display':                     // *          readlineExt
 /* jshint eqnull:true */
           options[optionName] = value != null ? value : '';
 /* jshint eqnull:false */
@@ -466,30 +475,37 @@ function flattenArray(array, validate) {
 exports._useExtSet = function(use) { useExt = use; };
 
 exports.prompt = function(options) {
-  var readOptions = margeOptions(true, options);
-  readOptions.display = readOptions.prompt;
-  return _readlineSync(readOptions);
+  var readOptions = margeOptions(true, options),
+    limit = readOptions.limit, res;
+  readOptions.display = readOptions.prompt + '';
+  readOptions.limit = ''; // for readlineExt
+  res = _readlineSync(readOptions);
+  return res;
 };
 
 exports.question = function(query, options) {
   var readOptions = margeOptions(margeOptions(true, options), {
       display:        query
-    });
-  return _readlineSync(readOptions);
+    }),
+    limit = readOptions.limit, res;
+  readOptions.display += '';
+  readOptions.limit = ''; // for readlineExt
+  res = _readlineSync(readOptions);
+  return res;
 };
 
 exports.keyIn = function(query, options) {
-  var limit = options ?
-      flattenArray(options.limit, function(value)
-        { return typeof value === 'string' || typeof value === 'number'; })
-      .join('').replace(/\n/g, '').replace(/[^A-Za-z0-9_ ]/g, '\\$&') : '',
-    readOptions = margeOptions(margeOptions(true, options), {
+  var readOptions = margeOptions(margeOptions(true, options), {
       display:        query,
       keyIn:          true,
-      limit:          limit,
       noTrim:         true
-    });
-  return _readlineSync(readOptions);
+    }), res;
+  readOptions.display += '';
+  readOptions.limit = readOptions.limit.filter(function(value)
+      { return typeof value === 'string' || typeof value === 'number'; })
+    .join('').replace(/\n/g, '').replace(/[^A-Za-z0-9_ ]/g, '\\$&');
+  res = _readlineSync(readOptions);
+  return res;
 };
 
 exports.setDefault = function(options) {