Ensure that the correct return type is used for strlen in the readme
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@ -461,7 +461,7 @@ The functions `make-downcall` and `make-varargs-factory` are provided to create
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these raw handles.
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```clojure
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(def raw-strlen (ffi/make-downcall "strlen" [::ffi/c-string] ::ffi/int))
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(def raw-strlen (ffi/make-downcall "strlen" [::ffi/c-string] ::ffi/long))
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(raw-strlen (ffi/serialize "hello" ::ffi/c-string))
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;; => 5
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```
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