Show the IP address, if available, in the comment edit screen submit meta box. props leewillis77. fixes #24638.

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Consistently wrap `author` and `excerpt` nodes with `CDATA` in feeds.

Fixes #18056.


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Ignore user ID post data.

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Tighten allowed upload file types.

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Validate referrers to prevent off-domain redirects.

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Better protocol validation in set_url_scheme().

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Loose validation for is_serialized() in maybe_serialize().

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Introduce `get_previous_post_link()`, `get_next_post_link()`, and `get_adjacent_post_link()`. Allows developers to retrieve the value without `echo`ing.

Props yoavf, markjaquith, SergeyBiryukov.
Fixes #17302.


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Add filter `flush_rewrite_rules_hard` to give devs chance to prevent writing to file when hard-flushing rewrite rules.

Props jeremyfelt, nacin.
Fixes #23491.


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Add an additional available param (the `WP_User` instance) to the `user_has_cap` filter.

Props Viper007Bond.
Fixes #24490.


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