I thought I'd put this note out in case anyone happens to run into spec 
functions freezing (e.g conform, valid?).

I had a large namespace of specs, where one spec was just an alias of 
another:

(s/def ::a int?)

;; other definitions

(s/def ::b ::a)

At a later point, I no longer needed the specificity of the ::b key, so I 
did a rename refactoring of ::b to ::a. I was a bit careless and didn't 
notice that my namespace now looked like:

(s/def ::a int?)

;; other definitions

(s/def ::a ::a)

Any usage of ::a caused spec to hang:

(s/conform ::a 10)

;; get coffee and contemplate the meaning of life, the universe, and 
everything

I'm not sure if makes sense to add any checks to prevent this from 
happening, but hopefully it helps if anyone accidentally does this.

Cheers,
Shaun

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