Better inspect for floats

lib/elixir/lib/binary/inspect.ex

@@ -272,7 +272,7 @@ defimpl Binary.Inspect, for: List do
       keywords?(thing) ->
         "[" <> join_keywords(thing, opts) <> "]"
       true ->
-        container_join(thing, "[", "]", opts)      
+        container_join(thing, "[", "]", opts)
     end
   end
 
@@ -285,7 +285,7 @@ defimpl Binary.Inspect, for: List do
     keywords?(rest, key)
   end
   defp keywords?([], _prev), do: true
-  defp keywords?(_other, _prev), do: false  
+  defp keywords?(_other, _prev), do: false
 
   defp join_keywords(thing, opts) do
     Enum.join(lc {key, value} inlist thing do
@@ -416,7 +416,7 @@ defimpl Binary.Inspect, for: Number do
   end
 
   def inspect(thing, _) do
-    list_to_binary float_to_list(thing)
+    list_to_binary :io_lib.format("~p", [thing])
   end
 end
 

lib/elixir/test/elixir/binary/inspect_test.exs

@@ -84,9 +84,10 @@ defmodule Binary.Inspect.NumberTest do
   end
 
   test :float do
-    assert inspect(1.0) == "1.00000000000000000000e+00"
-    assert inspect(1.0e10) == "1.00000000000000000000e+10"
-    assert inspect(1.0e+10) == "1.00000000000000000000e+10"
+    assert inspect(1.0) == "1.0"
+    assert inspect(1.0e10) == "1.0e10"
+    assert inspect(1.0e+10) == "1.0e10"
+    assert inspect(1.0e-10) == "1.0e-10"
   end
 end
 
@@ -155,7 +156,7 @@ defmodule Binary.Inspect.ListTest do
   end
 
   test :non_printable do
-    assert inspect([{:b, 1},{:a,1}]) == "[{:b,1},{:a,1}]"  
+    assert inspect([{:b, 1},{:a,1}]) == "[{:b,1},{:a,1}]"
   end
 
   test :unproper do