Add support for array-like fields

Readme.md

@@ -120,7 +120,7 @@ If you want checksums calculated for incoming files, set this to either `'sha1'`
 ```javascript
 form.multiples = false;
 ```
-If this option is enabled, when you call `form.parse`, the `files` argument will contain arrays of files for inputs which submit multiple files using the HTML5 `multiple` attribute.
+If this option is enabled, when you call `form.parse`, the `files` argument will contain arrays of files for inputs which submit multiple files using the HTML5 `multiple` attribute. Also, the `fields` argument will contain arrays of values for fields that have names ending with '[]'.
 
 ```javascript
 form.bytesReceived

lib/incoming_form.js

@@ -82,7 +82,21 @@ IncomingForm.prototype.parse = function(req, cb) {
     var fields = {}, files = {};
     this
       .on('field', function(name, value) {
-        fields[name] = value;
+        if (this.multiples && name.substr(name.length-2) === '[]') {
+          name = name.substr(0, name.length-2);
+          if (fields[name]) {
+            if (!Array.isArray(fields[name])) {
+              fields[name] = [fields[name]];
+            }
+            fields[name].push(value);
+          }
+          else {
+            fields[name] = value;
+          }
+        }
+        else {
+          fields[name] = value;
+        }
       })
       .on('file', function(name, file) {
         if (this.multiples) {