Location keys `latitude` and `longitude` both require a `list[list[int|float]]` but do not distinguish between nested levels.

[conmakMIT]

Enforce that the proper way to handle this is something like:

    "latitude": [[43.78], [39.82]],
    "longitude": [[-79.63], [-86.18]],

[conmakMIT]

You should go ahead and check other keys in the locations dict to make sure they work.