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    Supports the following objects and types by default:

    +-------------------+---------------+
    | Python            | JSON          |
    +===================+===============+
    | dict              | object        |
    +-------------------+---------------+
    | list, tuple       | array         |
    +-------------------+---------------+
    | str, unicode      | string        |
    +-------------------+---------------+
    | int, long, float  | number        |
    +-------------------+---------------+
    | True              | true          |
    +-------------------+---------------+
    | False             | false         |
    +-------------------+---------------+
    | None              | null          |
    +-------------------+---------------+

    To extend this to recognize other objects, subclass and implement a
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        If ensure_ascii is true, the output is guaranteed to be str
        objects with all incoming unicode characters escaped.  If
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        If check_circular is true, then lists, dicts, and custom encoded
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        Otherwise, no such check takes place.

        If allow_nan is true, then NaN, Infinity, and -Infinity will be
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