Python 3: Wrap dict.values() with list() before JSON serialisation
Python 3: Wrap dict.values() with list() before JSON serialisation

I Python 3 `dict.values()` return a `dict_values` object which isn't JSON
serialisable, but wrapping it in `list()` makes it a normal list instead:
https://markhneedham.com/blog/2017/03/19/python-3-typeerror-object-type-dict_values-not-json-serializable/

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