* remove unused import
* fix mixtyping (duplicated ;)
* remove redundant type casting
detail: item's type is defined as short.
* Revert "remove redundant type casting"
This reverts commit 39bf91d9ff.
* remove unused import
* fix mixtyping (duplicated ;)
* remove redundant type casting
detail: item's type is defined as short.
* Revert "remove redundant type casting"
This reverts commit 39bf91d9ff.