def slotsToJSON(obj, slots=None):
    """Converts the given Python object to one suitable for Javascript
    Object Notation (JSON) serialization via :func:`json.dump` or
    :func:`json.dumps`.  This function delegates to :func:`toJSON`.

    Specifically only attributes in the list of *slots* are converted.
    If *slots* is not provided, it defaults to the object's
    ``__slots__` and any inherited ``__slots__``.

    To omit certain slots from serialization, the object may define a
    :meth:`__jsonOmit__(key, val)` method.  When the method returns
    True for any particular slot name (i.e. key) and value
    combination, the slot will not serialized.
    """
    if slots is None:
        slots = list(obj.__slots__) if hasattr(obj, '__slots__') else [ ]
        for base in obj.__class__.__bases__:
            if hasattr(base, '__slots__'):
                slots.extend(base.__slots__)

    testOmit = hasattr(obj, '__jsonOmit__') and callable(obj.__jsonOmit__)
    result   = { }

    for slot in slots:
        key = slot[1:] if slot.startswith('_') else slot
        val = getattr(obj, slot, None)

        if testOmit is False or obj.__jsonOmit__(key, val) is False:
            result[key] = toJSON(val)

    return result