Using defmsg can cause duplicate printing with alt spec

[bhb]

Given this spec for map

https://github.com/slipset/speculative/blob/c0c31d4e055346cb7caa831e28df8f96dda071be/src/speculative/core.cljc#L100-L106

And this message definition

(expound/defmsg ::speculative/ifn "should be a function (or a value that can be *treated* like a function e.g. a set or keyword)")

For the call (map 1 2), expound will print

Function arguments

  (1 2)
   ^

should be a function (or a value that can be *treated* like a function e.g. a set or keyword)

or

should be a function (or a value that can be *treated* like a function e.g. a set or keyword)

[bhb]

Fixed as of 957302b