more todos, code style

docs/code_style.md

-Yii2 core code style
-====================
+Yii2 code standard
+==================
+
+This code standard is used for all the Yii2 core classes and can be applied to
+your application in order to achieve consistency among your team. Also it will
+help in case you want to opensource code.
+
+
+PHP file formatting
+-------------------
+
+### General
+
+- Do not use `?>` for files containing PHP code only.
+- Files should be encoded in UTF-8.
+
+### Indentation
+
+All major PHP frameworks and libraries are using spaces. Common number is four:
+
+- Symfony 2: four spaces
+- Zend Framework 1: four spaces
+- Zend Framework 2: four spaces
+- Pear: four spaces
+
+
+### Maximum Line Length
+
+We're not strictly limiting maximum line length but sticking to 80 characters
+where possible.
+
+### Line Termination
 
 
-Proposals
----------
 
 ### Brackets
 
@@ -46,4 +74,20 @@ public function __construct($connection)
 {
 	$this->connection = $connection;
 }
-~~~
\ No newline at end of file
+~~~
+
+### Other library and framework standards
+
+It's good to be consistent with other frameworks and libraries whose components
+will be possibly used with Yii2. That's why when there are no objective reasons
+to use different style we should use one that's common among most of the popular
+libraries and frameworks.
+
+That's not only about PHP but about JavaScript as well. Since we're using jQuery
+a lot it's better to be consistent with its style as well.
+
+- [Symfony 2](http://symfony.com/doc/current/contributing/code/standards.html)
+- [Zend Framework 1](http://framework.zend.com/manual/en/coding-standard.coding-style.html)
+- [Zend Framework 2](http://framework.zend.com/wiki/display/ZFDEV2/Coding+Standards)
+- [Pear](http://pear.php.net/manual/en/standards.php)
+- [jQuery](http://docs.jquery.com/JQuery_Core_Style_Guidelines)
\ No newline at end of file

todo.md

@@ -13,7 +13,8 @@
 	* type conversion rules
 	* CompareValidator::clientValidateAttribute(): search for "CHtml::activeId"
 	* FileValidator, UniqueValidator, ExistValidator, DateValidator: TBD
-	* consider merging UniqueValidator and ExistValidator and using a NOT property.
+	* consider merging UniqueValidator and ExistValidator and using a NOT property: array('!exist', …)
+	* when getting errors from getErrors it will be good to have which validator (at least type) failed exactly.
 - console command support [DONE]
 - built-in console commands
 	+ api doc builder