In the iOS implementation, a new dispatch queue is created on each 'set' or 'get' call, from which it switches to the main queue to call MMKV, wrapped in a try/catch block.

Inside the MMKV library, a NSData object is created, another class is used to write a single "int" value to it, then the data object is used as the "raw" value for the given key.

I haven't looked any futher but already this seems like a lot of work to set a number in memory. Is there any reason for this?