extend default in cljs

[lilactown]

version

0.3.32 and master

platform

macOS 12.4 / Nodejs v18.3.0

problem

The behavior of (extend-type default ,,,) and (extend-protocol IFoo default ,,,) is different than vanilla CLJS.

repro

There are few different cases.

extend-type:

(defprotocol IFoo (foo [_]))
(extend-type default
 IFoo (foo [_] :default))

(map #(vector (satisfies? IFoo %) (foo %)) [#js {} "" 1 #js [] inc true (js/Object.create nil)])

extend-protocol:

(defprotocol IFoo (foo [_]))
(extend-protocol IFoo
 default (foo [_] :default))

(map #(vector (satisfies? IFoo %) (foo %)) [#js {} "" 1 #js [] inc true (js/Object.create nil)])

expected behavior

The extend-type example should return:

([true :default] [true :default] [true :default] [true :default] [true :default] [true :default] [true :default])

but it will work only for #js {} and does not implement the protocol on any other type.

The extend-protocol example should return the same, but will try and resolve the symbol default and fail.