[Fix clojure-emacs/cider#2979] Convert non-integer numbers to string

They are not supported by bencode.

Author: bbatsov

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Bugs Fixed
+
+* [cider#2979](https://github.com/clojure-emacs/cider/issues/2979): Convert non-integer numbers to strings.
+
 ## 0.25.8 (2021-01-25)
 
 ### Bugs Fixed

src/cider/nrepl/middleware/util.clj

@@ -8,7 +8,13 @@
 
 (defmethod transform-value :default [v] (str v))
 
-(defmethod transform-value Number [v] v)
+(defmethod transform-value Number
+  [v]
+  ;; bencode supports only integers, so we convert
+  ;; other numbers (e.g. floats) to string
+  (if (integer? v)
+    v
+    (str v)))
 
 (defmethod transform-value nil [v] nil)