wp-includes/rss.php:287$text function append_content($text) { if ( $this->initem ) { $this->concat( $this->current_item[ $this->incontent ], $text ); } elseif ( $this->inchannel ) { $this->concat( $this->channel[ $this->incontent ], $text ); } }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rss.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.