.. attribute:: client_key: str
A unique identifier for this client. This is generally an opaque
string generated by the client itself.
.. attribute:: wants_what: {TaskState}
A set of tasks this client wants kept in memory, so that it can
download its result when desired. This is the reverse mapping of
:class:`TaskState.who_wants`.
Tasks are typically removed from this set when the corresponding
object in the client's space (for example a ``Future`` or a Dask
collection) gets garbage-collected.
A simple object holding information about a client.
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