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    Supports the following objects and types by default:

    +-------------------+---------------+
    | Python            | JSON          |
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    | dict              | object        |
    +-------------------+---------------+
    | list, tuple       | array         |
    +-------------------+---------------+
    | str, unicode      | string        |
    +-------------------+---------------+
    | int, long, float  | number        |
    +-------------------+---------------+
    | True              | true          |
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    | False             | false         |
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    | None              | null          |
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        and the results are str instances consisting of ASCII
        characters only.  If ensure_ascii is False, a result may be a
        unicode instance.  This usually happens if the input contains
        unicode strings or the *encoding* parameter is used.

        If check_circular is true, then lists, dicts, and custom encoded
        objects will be checked for circular references during encoding to
        prevent an infinite recursion (which would cause an OverflowError).
        Otherwise, no such check takes place.

        If allow_nan is true, then NaN, Infinity, and -Infinity will be
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        If sort_keys is true, then the output of dictionaries will be
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        If indent is a non-negative integer, then JSON array
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