A new theme template has been added to the theme hierarchy as of r32846: singular.php. This template follows the rules of is_singular and is used for a single post, irregardless of post type. It comes in the hierarchy after single.php, page.php, and the variations of each. Themes that used the same code for both of those files (or included one in the other) can now simplify down to the one template.
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New wp_page_menu() API that creates a menu of pages. Themes will no longer have to do this for themselves.
fixoring edge cases.