diff -r e065aec0e6fa Lib/json/encoder.py
--- a/Lib/json/encoder.py	Thu Sep 01 11:21:56 2016 -0700
+++ b/Lib/json/encoder.py	Thu Sep 01 15:00:33 2016 -0500
@@ -28,7 +28,7 @@
     #ESCAPE_DCT.setdefault(chr(i), '\\u%04x' % (i,))
 
 INFINITY = float('inf')
-FLOAT_REPR = repr
+FLOAT_REPR = str
 
 def encode_basestring(s):
     """Return a JSON representation of a Python string
diff -r e065aec0e6fa Modules/_json.c
--- a/Modules/_json.c	Thu Sep 01 11:21:56 2016 -0700
+++ b/Modules/_json.c	Thu Sep 01 15:00:33 2016 -0500
@@ -1961,7 +1961,7 @@
         }
     }
     /* Use a better float format here? */
-    return PyObject_Repr(obj);
+    return PyObject_Str(obj);
 }
 
 static PyObject *