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				|  |  | +  o Infrastructure features:
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				|  |  | +    - Introduce new circuitmux_t storing the queue of circuits for a channel;
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				|  |  | +      this encapsulates and abstracts the queue logic and circuit selection
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				|  |  | +      policy, and allows the latter to be overridden easily by switching out
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				|  |  | +      a policy object.  The existing EWMA behavior is now implemented as a
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				|  |  | +      circuitmux_policy_t.  This fixes bug 6816.
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