wp-includes/ID3/module.audio-video.flv.php:655bool public function readBoolean() { return $this->stream->readByte() == 1; }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.flv.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.