silverstripe-framework/docs/en/changelogs/3.1.0.md

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# 3.1.0 (unreleased)
## Overview ##
## Upgrading
* `Object::has_extension()` and `Object::add_extension()` deprecated in favour of using late static binding, please use `{class}::has_extension()` and `{class}::add_extension()` instead, where {class} is the class name of your DataObject class.
* Removed `SiteTree.MetaTitle` and `SiteTree.MetaKeywords` since they are irrelevant in terms of SEO ([1](http://www.seomoz.org/learn-seo/title-tag), [2](http://www.mattcutts.com/blog/keywords-meta-tag-in-web-search/)) and general page informancy
* Deprecated `Profiler` class, use third-party solutions like [xhprof](https://github.com/facebook/xhprof/)
* Removed defunct or unnecessary debug GET parameters:
`debug_profile`, `debug_memory`, `profile_trace`, `debug_javascript`, `debug_behaviour`
* Removed `Member_ProfileForm`, use `CMSProfileController` instead
* `SiteTree::$nested_urls` enabled by default. To disable, call `SiteTree::disable_nested_urls()`.
* Removed CMS permission checks from `File->canEdit()` and `File->canDelete()`. If you have unsecured controllers relying on these permissions, please override them through a `DataExtension`.