Fix a compatibility issue with the "reserved" parameter.

 Initially the "reserved" parameter was intended to create blank entries that would immediately be usable with Array[Get|Set] functions. This functionality was never working as intended. Since the PR which updates the library, this is working as expected, but this now breaks all plugins as by default "reserved" value was set to 32.

This patches brings back the old behavior. Now if coder wants to create real blank entries, they can achieve this by calling  ```ArrayResize```.

Documentation will be handled by Nextra.