Features
* Added support for arrays in arguments and return values. (55)
* Added the ability to cast Java objects from one class to another. (58)
* Local JNI Instances can be converted into global JNI instances using `__global__()` (59)
* Added support for Python 3.9 and 3.10. (62, 66)
* Methods that accept a Java `NULL` as an argument are now supported. (63)
* Methods that return `NULL` now return typed `NULL` objects. (67)