Update json.py

BUG : read_json with table='orient' causes unexpected type coercion pandas-dev#21345

Author: uds5501

pandas/io/json/json.py

@@ -706,12 +706,12 @@ def _try_convert_data(self, name, data, use_dtypes=True,
                 except (TypeError, ValueError):
                     pass
 
-        # do't coerce 0-len data
+        # don't coerce 0-len data
         if len(data) and (data.dtype == 'float' or data.dtype == 'object'):
 
-            # coerce ints if we can
+            # coerce float if we can
             try:
-                new_data = data.astype('int64')
+                new_data = data.astype('float64')
                 if (new_data == data).all():
                     data = new_data
                     result = True
@@ -721,7 +721,7 @@ def _try_convert_data(self, name, data, use_dtypes=True,
         # coerce ints to 64
         if data.dtype == 'int':
 
-            # coerce floats to 64
+            # coerce ints to 64
             try:
                 data = data.astype('int64')
                 result = True