wp-includes/IXR/class-IXR-base64.php:16$data function __construct( $data ) { $this->data = $data; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/IXR/class-IXR-base64.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.