f5fcdc7b49
From all the resources I found about type hinting in macros,
it doesn't work like it does for normal functions.
I got reflection warnings for a code like this:
```clj
(let [conn (mg/connect)
db (delay (mg/get-db conn "monger-test"))]
(with-collection @db "something"
(find {})))
```
The type hint for `db` didn't work. Actually the type hint that works
comes from the function `core/get-db` and we see this when we remove
`delay` from the code above. As we could expect, the function `deref`
doesn't propagate the type hint.
I did similar tests with the collection name and no reflection warning
was raised for any case. In addition, it looked weird for me to have
a type hint like `^String` and then a checking like `string?` later.
Some references:
* http://stackoverflow.com/questions/11919602/generating-clojure-code-with-type-hints
* Clojure High Performance Programming, page 44.
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