rubinius/rubinius — pull request #2479 by kachick (2013-07-21 17:32:12+00:00)
Title: Initialize_{dup,clone} should automatically become a private method as initialize_copy from 2.0

Is Array#include? a good way at here?
Or regexp?

```ruby
/\Ainitialize(?:_(?:copy|dup|clone))?\z/
```