Dynamic, heterogeneous dictionaries with tuple keys and non-constant tuple slicing

Numba Support: How do I do ...?
2

Forgot to mention: Some of the suggestions by @stuartarchibald in the related post are relevant here. In particular, drop_elements should solve my problem 3. I was also trying to use the TupleKeyDict class defined there to solve my other problems: one idea would be to have filtration be an int: TupleKeyDict dictionary so as to get around the heterogeneity problem. But I have not been able to make something as simple as this work:

@njit
def foo():
    d = {}
    for i in range(2):
        # Create a dictionary to wrap
        wrapped_dictionary = Dict.empty(types.intp, types.float64)
        # wrap it
        d[i] = TupleKeyDict(wrapped_dictionary)
        d[i][(1, 2)] = 4.
    return d
    
foo()