1.  How to combine protocols?

For example I have protocols walks, talks, sleeps, now how might I
come up with an abstraction which walks-talks-and-sleeps ?  In Java
one might create an interface which extends multiple interfaces.
Although getting an instance which walks-talks-and-sleeps is made easy
with deftype.

On a related note if I have a protocol P how can I create a protocol
with is a union of P and java.lang.Comparable ?


2. Does it make sense to have "static" fns as part of Clojure
protocols?

For example a fn such as can-walk? could make sense as part of the
walks protocol.

I realize I can create a (defn can-walk? ...) in the protocol ns and
its the same from caller's pov .. (proto-ns/can-walk? ...).  But how
about having can-I-walk? as part of the walks protocol itself (somehow
to me it gives a more complete feeling).

Thanks.

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