Ensure that when processing bools we do a "!=0" test; we don't just want to...

Ensure that when processing bools we do a "!=0" test; we don't just want to store `7` as a bool - that causes problems sometimes.

Dapper/SqlMapper.cs

@@ -1939,6 +1939,13 @@ public static void SetTypeMap(Type type, ITypeMap map)
                                 { // unbox as the data-type, then use IL-level convert
                                     il.Emit(OpCodes.Unbox_Any, dataType); // stack is now [target][target][data-typed-value]
                                     il.Emit(opCode); // stack is now [target][target][typed-value]
+                                    if (unboxTypeCode == TypeCode.Boolean)
+                                    { // compare to zero; I checked "csc" - this is the trick it uses; nice
+                                        il.Emit(OpCodes.Ldc_I4_0);
+                                        il.Emit(OpCodes.Ceq);
+                                        il.Emit(OpCodes.Ldc_I4_0);
+                                        il.Emit(OpCodes.Ceq);
+                                    }
                                 }
                                 else
                                 { // use flexible conversion

Tests/Tests.cs

@@ -1937,6 +1937,27 @@ select @A
             var item = connection.Query<int>("#TestProcWithIndexer", new ParameterWithIndexer(), commandType: CommandType.StoredProcedure).Single();
         }
 
+        public void Issue_40_AutomaticBoolConversion()
+        {
+            var user = connection.Query<Issue40_User>("select UserId=1,Email='abc',Password='changeme',Active=cast(1 as tinyint)").Single();
+            user.Active.IsTrue();
+            user.UserID.IsEqualTo(1);
+            user.Email.IsEqualTo("abc");
+            user.Password.IsEqualTo("changeme");
+        }
+
+        public class Issue40_User
+        {
+          public Issue40_User()
+          {
+             Email = Password = String.Empty;
+          }
+          public int UserID { get; set; }
+          public string Email { get; set; }
+          public string Password { get; set; }
+          public bool Active { get; set; }
+        }
+
         class TransactedConnection : IDbConnection
         {
             IDbConnection _conn;