Issue 130: don't try to convert to object

Dapper NET40/SqlMapper.cs

@@ -1299,7 +1299,7 @@ private static IEnumerable<T> QueryImpl<T>(this IDbConnection cnn, CommandDefini
                     object val = func(reader);
                     if (effectiveType == typeof(object))
                     {
-                        yield return (T)Convert.ChangeType(val, effectiveType);
+                        yield return (T)(object)val;
                     } else if (val == null || val is T) {
                         yield return (T)val;
                     } else {

Tests/Tests.cs

@@ -3146,6 +3146,21 @@ public void SO24740733_TestCustomValueSingleColumn()
             foo.Value.IsEqualTo(200);
         }
 
+        public void Issue130_IConvertible()
+        {
+            dynamic row = connection.Query("select 1 as [a], '2' as [b]").Single();
+            int a = row.a;
+            string b = row.b;
+            a.IsEqualTo(1);
+            b.IsEqualTo("2");
+
+            row = connection.Query<dynamic>("select 3 as [a], '4' as [b]").Single();
+            a = row.a;
+            b = row.b;
+            a.IsEqualTo(3);
+            b.IsEqualTo("4");
+        }
+
 #if POSTGRESQL
 
         class Cat