Awesome rewrite bug: the `page` query var was being set to `'/4'` in `$wp`. When cast to `int`, it returns `0` (Bless you, PHP). `WP_Query` calls `trim( $page, '/' )` when setting its own query var. The few places that were checking `page` before posts were queried now have sanity checks, so that these changes work without flushing rewrites.
Adds/updates unit tests.
Props wonderboymusic, dd32.
See #11694.
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The rewrite functions have all kinds of cross-dependencies (like `WP_Query`), so loading the file by itself would have been bizarre (and still is).
Creates:
`rewrite-constants.php`
`rewrite-functions.php`
`class-wp-rewrite.php`
`rewrite.php` contains only top-level code. Class file only contains the class. Functions file only contains functions.
See #33413.
Built from https://develop.svn.wordpress.org/trunk@33751
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Scott Taylor