wp-includes/IXR/class-IXR-clientmulticall.php:33$args function addCall( ...$args ) { $methodName = array_shift($args); $struct = array( 'methodName' => $methodName, 'params' => $args ); $this->calls[] = $struct; }Introduced in 1.5.0. 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-clientmulticall.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.