seems like i can use an interface in deftype, but i can't subsequently
make the type participate in an interface, only a protocol, which is
confusing to me: i expected extend to be less restrictive, if
anything, than deftype. (or am i just getting the syntax horribly
wrong again? it didn't seem like it, looking at the docs.)
user=> (deftype Btype [f1])
#'user/Btype
user=> (deftype Ctype [] clojure.lang.Counted (count [] 0))
#'user/Ctype
user=> (extend ::Btype clojure.lang.Counted {:count (fn [t] 0)})
java.lang.NullPointerException (NO_SOURCE_FILE:0)
user=> (defprotocol P (foo [x]))
P
user=> (extend ::Btype P {:foo (fn [t] 0)})
nil
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