> (deftype Foo [a b c])
>
> (defprotocol P (bar [x] "bar docs"))
>
> (extend ::Foo P {:bar (fn [afoo] :foo-thing)})
>
A common error may be to:
(extend Foo P {:bar (fn [afoo] :foo-thing)})
when (extend ::Foo ... is intended. I notice that (extend Foo...
doesn't throw - should extend check that it is supplied a class,
intfc, or keyword and throw if something else is supplied?
Alternately, could extend be changed to allow (extend Foo ... and do
the right thing ? ie determine that Foo is the constructor function
for a type and do the extension for the type Foo.
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