diff --git a/test/test_config_ip.py b/test/test_config_ip.py
index 049c2ec..a515808 100644
--- a/test/test_config_ip.py
+++ b/test/test_config_ip.py
@@ -119,58 +119,58 @@ def test_port():
     f = PortOption('f', '', allow_private=True)
     od = OptionDescription('od', '', [a, b, c, d, e, f])
     cfg = Config(od)
-    raises(ValueError, "cfg.option('a').value.set(0)")
-    cfg.option('a').value.set(1)
-    cfg.option('a').value.set(1023)
-    cfg.option('a').value.set(1024)
-    cfg.option('a').value.set(49151)
-    raises(ValueError, "cfg.option('a').value.set(49152)")
-    raises(ValueError, "cfg.option('a').value.set(65535)")
-    raises(ValueError, "cfg.option('a').value.set(65536)")
+    raises(ValueError, "cfg.option('a').value.set('0')")
+    cfg.option('a').value.set('1')
+    cfg.option('a').value.set('1023')
+    cfg.option('a').value.set('1024')
+    cfg.option('a').value.set('49151')
+    raises(ValueError, "cfg.option('a').value.set('49152')")
+    raises(ValueError, "cfg.option('a').value.set('65535')")
+    raises(ValueError, "cfg.option('a').value.set('65536')")
 
-    cfg.option('b').value.set(0)
-    cfg.option('b').value.set(1)
-    cfg.option('b').value.set(1023)
-    cfg.option('b').value.set(1024)
-    cfg.option('b').value.set(49151)
-    raises(ValueError, "cfg.option('b').value.set(49152)")
-    raises(ValueError, "cfg.option('b').value.set(65535)")
-    raises(ValueError, "cfg.option('b').value.set(65536)")
+    cfg.option('b').value.set('0')
+    cfg.option('b').value.set('1')
+    cfg.option('b').value.set('1023')
+    cfg.option('b').value.set('1024')
+    cfg.option('b').value.set('49151')
+    raises(ValueError, "cfg.option('b').value.set('49152')")
+    raises(ValueError, "cfg.option('b').value.set('65535')")
+    raises(ValueError, "cfg.option('b').value.set('65536')")
 
-    cfg.option('c').value.set(0)
-    cfg.option('c').value.set(1)
-    cfg.option('c').value.set(1023)
-    raises(ValueError, "cfg.option('c').value.set(1024)")
-    raises(ValueError, "cfg.option('c').value.set(49151)")
-    raises(ValueError, "cfg.option('c').value.set(49152)")
-    raises(ValueError, "cfg.option('c').value.set(65535)")
-    raises(ValueError, "cfg.option('c').value.set(65536)")
+    cfg.option('c').value.set('0')
+    cfg.option('c').value.set('1')
+    cfg.option('c').value.set('1023')
+    raises(ValueError, "cfg.option('c').value.set('1024')")
+    raises(ValueError, "cfg.option('c').value.set('49151')")
+    raises(ValueError, "cfg.option('c').value.set('49152')")
+    raises(ValueError, "cfg.option('c').value.set('65535')")
+    raises(ValueError, "cfg.option('c').value.set('65536')")
 
-    cfg.option('d').value.set(0)
-    raises(ValueError, "cfg.option('d').value.set(1)")
-    raises(ValueError, "cfg.option('d').value.set(1023)")
-    raises(ValueError, "cfg.option('d').value.set(1024)")
-    raises(ValueError, "cfg.option('d').value.set(49151)")
-    raises(ValueError, "cfg.option('d').value.set(49152)")
-    raises(ValueError, "cfg.option('d').value.set(65535)")
-    raises(ValueError, "cfg.option('d').value.set(65536)")
+    cfg.option('d').value.set('0')
+    raises(ValueError, "cfg.option('d').value.set('1')")
+    raises(ValueError, "cfg.option('d').value.set('1023')")
+    raises(ValueError, "cfg.option('d').value.set('1024')")
+    raises(ValueError, "cfg.option('d').value.set('49151')")
+    raises(ValueError, "cfg.option('d').value.set('49152')")
+    raises(ValueError, "cfg.option('d').value.set('65535')")
+    raises(ValueError, "cfg.option('d').value.set('65536')")
 
-    cfg.option('e').value.set(0)
-    cfg.option('e').value.set(1)
-    cfg.option('e').value.set(1023)
-    cfg.option('e').value.set(1024)
-    cfg.option('e').value.set(49151)
-    cfg.option('e').value.set(49152)
-    cfg.option('e').value.set(65535)
+    cfg.option('e').value.set('0')
+    cfg.option('e').value.set('1')
+    cfg.option('e').value.set('1023')
+    cfg.option('e').value.set('1024')
+    cfg.option('e').value.set('49151')
+    cfg.option('e').value.set('49152')
+    cfg.option('e').value.set('65535')
 
-    raises(ValueError, "cfg.option('f').value.set(0)")
-    cfg.option('f').value.set(1)
-    cfg.option('f').value.set(1023)
-    cfg.option('f').value.set(1024)
-    cfg.option('f').value.set(49151)
-    cfg.option('f').value.set(49152)
-    cfg.option('f').value.set(65535)
-    raises(ValueError, "cfg.option('f').value.set(65536)")
+    raises(ValueError, "cfg.option('f').value.set('0')")
+    cfg.option('f').value.set('1')
+    cfg.option('f').value.set('1023')
+    cfg.option('f').value.set('1024')
+    cfg.option('f').value.set('49151')
+    cfg.option('f').value.set('49152')
+    cfg.option('f').value.set('65535')
+    raises(ValueError, "cfg.option('f').value.set('65536')")
 
 
 def test_port_range():
@@ -182,69 +182,69 @@ def test_port_range():
     f = PortOption('f', '', allow_range=True, allow_private=True)
     od = OptionDescription('od', '', [a, b, c, d, e, f])
     cfg = Config(od)
-    raises(ValueError, "cfg.option('a').value.set(0)")
-    cfg.option('a').value.set(1)
-    cfg.option('a').value.set(1023)
-    cfg.option('a').value.set(1024)
-    cfg.option('a').value.set(49151)
-    raises(ValueError, "cfg.option('a').value.set(49152)")
-    raises(ValueError, "cfg.option('a').value.set(65535)")
-    raises(ValueError, "cfg.option('a').value.set(65536)")
+    raises(ValueError, "cfg.option('a').value.set('0')")
+    cfg.option('a').value.set('1')
+    cfg.option('a').value.set('1023')
+    cfg.option('a').value.set('1024')
+    cfg.option('a').value.set('49151')
+    raises(ValueError, "cfg.option('a').value.set('49152')")
+    raises(ValueError, "cfg.option('a').value.set('65535')")
+    raises(ValueError, "cfg.option('a').value.set('65536')")
     cfg.option('a').value.set('1:49151')
     raises(ValueError, "cfg.option('a').value.set('0:49151')")
     raises(ValueError, "cfg.option('a').value.set('1:49152')")
 
-    cfg.option('b').value.set(0)
-    cfg.option('b').value.set(1)
-    cfg.option('b').value.set(1023)
-    cfg.option('b').value.set(1024)
-    cfg.option('b').value.set(49151)
-    raises(ValueError, "cfg.option('b').value.set(49152)")
-    raises(ValueError, "cfg.option('b').value.set(65535)")
-    raises(ValueError, "cfg.option('b').value.set(65536)")
+    cfg.option('b').value.set('0')
+    cfg.option('b').value.set('1')
+    cfg.option('b').value.set('1023')
+    cfg.option('b').value.set('1024')
+    cfg.option('b').value.set('49151')
+    raises(ValueError, "cfg.option('b').value.set('49152')")
+    raises(ValueError, "cfg.option('b').value.set('65535')")
+    raises(ValueError, "cfg.option('b').value.set('65536')")
     cfg.option('b').value.set('0:49151')
     raises(ValueError, "cfg.option('b').value.set('0:49152')")
 
-    cfg.option('c').value.set(0)
-    cfg.option('c').value.set(1)
-    cfg.option('c').value.set(1023)
-    raises(ValueError, "cfg.option('c').value.set(1024)")
-    raises(ValueError, "cfg.option('c').value.set(49151)")
-    raises(ValueError, "cfg.option('c').value.set(49152)")
-    raises(ValueError, "cfg.option('c').value.set(65535)")
-    raises(ValueError, "cfg.option('c').value.set(65536)")
+    cfg.option('c').value.set('0')
+    cfg.option('c').value.set('1')
+    cfg.option('c').value.set('1023')
+    raises(ValueError, "cfg.option('c').value.set('1024')")
+    raises(ValueError, "cfg.option('c').value.set('49151')")
+    raises(ValueError, "cfg.option('c').value.set('49152')")
+    raises(ValueError, "cfg.option('c').value.set('65535')")
+    raises(ValueError, "cfg.option('c').value.set('65536')")
     cfg.option('c').value.set('0:1023')
     raises(ValueError, "cfg.option('c').value.set('0:1024')")
 
-    cfg.option('d').value.set(0)
-    raises(ValueError, "cfg.option('d').value.set(1)")
-    raises(ValueError, "cfg.option('d').value.set(1023)")
-    raises(ValueError, "cfg.option('d').value.set(1024)")
-    raises(ValueError, "cfg.option('d').value.set(49151)")
-    raises(ValueError, "cfg.option('d').value.set(49152)")
-    raises(ValueError, "cfg.option('d').value.set(65535)")
-    raises(ValueError, "cfg.option('d').value.set(65536)")
+    cfg.option('d').value.set('0')
+    raises(ValueError, "cfg.option('d').value.set('1')")
+    raises(ValueError, "cfg.option('d').value.set('1023')")
+    raises(ValueError, "cfg.option('d').value.set('1024')")
+    raises(ValueError, "cfg.option('d').value.set('49151')")
+    raises(ValueError, "cfg.option('d').value.set('49152')")
+    raises(ValueError, "cfg.option('d').value.set('65535')")
+    raises(ValueError, "cfg.option('d').value.set('65536')")
     raises(ValueError, "cfg.option('d').value.set('0:0')")
     raises(ValueError, "cfg.option('d').value.set('0:1')")
 
-    cfg.option('e').value.set(0)
-    cfg.option('e').value.set(1)
-    cfg.option('e').value.set(1023)
-    cfg.option('e').value.set(1024)
-    cfg.option('e').value.set(49151)
-    cfg.option('e').value.set(49152)
-    cfg.option('e').value.set(65535)
+    cfg.option('e').value.set('0')
+    cfg.option('e').value.set('1')
+    cfg.option('e').value.set('1023')
+    cfg.option('e').value.set('1024')
+    cfg.option('e').value.set('49151')
+    cfg.option('e').value.set('49152')
+    cfg.option('e').value.set('65535')
     cfg.option('e').value.set('0:65535')
     raises(ValueError, "cfg.option('e').value.set('0:65536')")
 
-    raises(ValueError, "cfg.option('f').value.set(0)")
-    cfg.option('f').value.set(1)
-    cfg.option('f').value.set(1023)
-    cfg.option('f').value.set(1024)
-    cfg.option('f').value.set(49151)
-    cfg.option('f').value.set(49152)
-    cfg.option('f').value.set(65535)
-    raises(ValueError, "cfg.option('f').value.set(65536)")
+    raises(ValueError, "cfg.option('f').value.set('0')")
+    cfg.option('f').value.set('1')
+    cfg.option('f').value.set('1023')
+    cfg.option('f').value.set('1024')
+    cfg.option('f').value.set('49151')
+    cfg.option('f').value.set('49152')
+    cfg.option('f').value.set('65535')
+    raises(ValueError, "cfg.option('f').value.set('65536')")
     cfg.option('f').value.set('1:65535')
     cfg.option('f').value.set('3:4')
     raises(ValueError, "cfg.option('f').value.set('0:65535')")
diff --git a/test/test_dyn_optiondescription.py b/test/test_dyn_optiondescription.py
index f29426d..e3887ff 100644
--- a/test/test_dyn_optiondescription.py
+++ b/test/test_dyn_optiondescription.py
@@ -860,7 +860,7 @@ def test_all_dyndescription():
     api.option('dodval1.intrval1').value.set(1)
     api.option('dodval1.floaval1').value.set(0.1)
     api.option('dodval1.unival1').value.set(u"no")
-    api.option('dodval1.portval1').value.set(80)
+    api.option('dodval1.portval1').value.set('80')
     api.option('dodval1.broadval1').value.set("1.1.1.255")
     api.option('dodval1.domainval1').value.set("test.com")
     api.option('dodval1.emailval1').value.set("test@test.com")
@@ -877,7 +877,7 @@ def test_all_dyndescription():
     assert api.option('dodval1.intrval1').value.get() == 1
     assert api.option('dodval1.floaval1').value.get() == 0.1
     assert api.option('dodval1.unival1').value.get() == u"no"
-    assert api.option('dodval1.portval1').value.get() == 80
+    assert api.option('dodval1.portval1').value.get() == '80'
     assert api.option('dodval1.broadval1').value.get() == "1.1.1.255"
     assert api.option('dodval1.domainval1').value.get() == "test.com"
     assert api.option('dodval1.emailval1').value.get() == "test@test.com"
diff --git a/test/test_option_setting.py b/test/test_option_setting.py
index 86e10b1..df49cbc 100644
--- a/test/test_option_setting.py
+++ b/test/test_option_setting.py
@@ -217,7 +217,7 @@ def test_apply_requires_from_config():
     api.option('int').value.set(1)
     raises(PropertiesOptionError, "api.option('opt.str').value.get()")
     assert 'hidden' in api.forcepermissive.option('opt.str').property.get()
-    assert 'hidden' not in api.forcepermissive.option('opt.str').property.get(apply_requires=False)
+    assert 'hidden' not in api.forcepermissive.option('opt.str').option.properties()
 
 
 def test_apply_requires_with_disabled():
@@ -232,7 +232,7 @@ def test_apply_requires_with_disabled():
     assert not 'disabled' in api.option('opt.str').property.get()
     api.option('int').value.set(1)
     raises(PropertiesOptionError, "api.option('opt.str').value.get()")
-    assert 'disabled' not in api.unrestraint.option('opt.str').property.get(apply_requires=False)
+    assert 'disabled' not in api.unrestraint.option('opt.str').option.properties()
     assert 'disabled' in api.unrestraint.option('opt.str').property.get()
 
 
diff --git a/tiramisu/option/option.py b/tiramisu/option/option.py
index 915857d..9740a18 100644
--- a/tiramisu/option/option.py
+++ b/tiramisu/option/option.py
@@ -346,16 +346,18 @@ class Option(BaseOption):
                                        check_error,
                                        is_warnings_only)
         except ValueError as err:
-            val_err = ValueOptionError(val,
+            if config_bag is undefined or \
+                    'demoting_error' not in config_bag.properties:
+                raise ValueOptionError(val,
                                        self._display_name,
                                        option_bag.ori_option,
                                        '{0}'.format(err))
-            if 'demoting_error' in config_bag.properties:
-                warnings.warn_explicit(val_err,
-                                       ValueErrorWarning,
-                                       self.__class__.__name__, 0)
-            else:
-                raise val_err
+            warnings.warn_explicit(ValueOptionError(val,
+                                                    self._display_name,
+                                                    option_bag.ori_option,
+                                                    '{0}'.format(err)),
+                                   ValueErrorWarning,
+                                   self.__class__.__name__, 0)
 
     def _validate_calculator(self,
                             callback: Callable,
diff --git a/tiramisu/option/syndynoption.py b/tiramisu/option/syndynoption.py
index 5dc82e2..08d2627 100644
--- a/tiramisu/option/syndynoption.py
+++ b/tiramisu/option/syndynoption.py
@@ -28,7 +28,8 @@ class SynDynOption:
     """
     __slots__ = ('rootpath',
                  'opt',
-                 'suffix')
+                 'suffix',
+                 '__weakref__')
 
     def __init__(self,
                  opt: BaseOption,