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    Recursively convert simple Python containers into pyrsistent versions
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    - set is converted to pset, but not recursively
    - tuple is converted to tuple, recursively.

    Sets and dict keys are not recursively frozen because they do not contain
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    support hash-by-id, which this function can't convert anyway.

    >>> freeze(set([1, 2]))
    pset([1, 2])
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    - tuple is converted to tuple, recursively.

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