$this->objectCache->makeKey( 'interwiki', $prefix ),
$this->objectCacheExpiry,
function ( $oldValue, &$ttl, array &$setOpts ) use ( $prefix ) {
$this->objectCache->makeKey( 'interwiki', $prefix ),
$this->objectCacheExpiry,
function ( $oldValue, &$ttl, array &$setOpts ) use ( $prefix ) {