Fix a bug where rdcards() doesn't work if you follow includes and return type dict

[rjyunis]

Good afternoon,

This corrects a small bug where rdcards() doesn't work when you request a return type of dict AND follow includes. When _rdinclude() returns (line 815), the values would already be a dictionary, so the for loop (line 826) val is a key (an int) instead of a list. This means len(val) on the following line doesn't work. If you just pass "array" to _rdinclude() instead, it will be read in correctly and converted later in the function.

I also cast key to int. Sometimes the keys are floats and I'm not sure why.

[rjyunis]

I'm marking this as ready to review, since the failing tests seem to be based on differences between python versions rather than code correctness. The cases fail even when I revert my changes.

[twmacro]

Thanks for the update, @rjyunis! I'm not sure why some tests aren't passing, but it seems unrelated to these updates.