Fix protocol? function

[mikesperber]

Some maps raise an exception on just calling the keyword. Use contains? instead.

[weavejester]

Can you give an example of a map that raises an exception upon calling the keyword?

Also can you change the Unbreak protocol? to Fix protocol? function.

[mikesperber]

@weavejester Sorry, just seeing your reply now!

Can you give an example of a map that raises an exception upon calling the keyword?

The records from Active Data are maps like this, and running lein codox there bombs:

https://github.com/active-group/active-data

[weavejester]

So custom record types might be defined in vars, and these might self-identify as Clojure maps, but lack the same lookup properties. I guess there's no harm in changing a lookup to a contains? check to avoid tripping up in that situation. Can you update the commit description as per my previous comment? Then I'll merge and cut a release.

[mikesperber]

Can you update the commit description as per my previous comment? Then I'll merge and cut a release.

@weavejester Done. Many thanks!