wp-includes/ID3/module.audio-video.matroska.php:1346$lengthint$check_bufferbooloptionalfalsestring|false private function readEBMLelementData($length, $check_buffer=false) { if ($check_buffer && !$this->EnsureBufferHasEnoughData($length)) { return false; } $data = substr($this->EBMLbuffer, $this->current_offset - $this->EBMLbuffer_offset, $length); $this->current_offset += $length; return $data; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ID3/module.audio-video.matroska.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.