$itemKey = array_keys( array_slice( $this->cachedChunks, 0, 1 ) );
$itemKey = array_shift( $itemKey );
- if ( !is_integer( $itemKey ) ) {
+ if ( !is_int( $itemKey ) ) {
wfWarn( "Attempted to get item with non-numeric key while " .
"the next item in the queue has a key ($itemKey) in " . __METHOD__ );
} elseif ( is_null( $itemKey ) ) {