[ListMonitor] [subscript(safeSectionIndex:safeItemIndex:)] Use `subscript(indexPath:)` after the validation of `sectionIndex` and `itemIndex` to get an object.
[ListMonitor] [subscript(safeSectionIndex:safeItemIndex:)] Use `subscript(indexPath:)` after the validation of `sectionIndex` and `itemIndex` to get an object.

There is a performance problem in Swift when getting an object from the Objective-C array with a large number of objects using subscript. It requires casting the array between Objective-C and Swift, that is pretty slow.

ruslanskorb/CoreStore,JohnEstropia/CoreStore,JohnEstropia/CoreStore,ruslanskorb/CoreStore