Read access/Write access for hashtables, maps, etc

Read/write access is very usable feature. You can do it even more usable by changing it's behaviour for hashtable or map. For example, if we have a hashtable and want to filter access by write, we should see put() and other methods that can change data; when we filter by read we should see get() and all read method (of course, if some write method return old value, it should be included there).

Thanks and happy holidays.