diff --git a/django_rest_tsg/typescript.py b/django_rest_tsg/typescript.py
index fbd30db..886497e 100644
--- a/django_rest_tsg/typescript.py
+++ b/django_rest_tsg/typescript.py
@@ -115,6 +115,9 @@ def tokenize_python_type(tp) -> list[Union[type, str]]:
     * Brackets: '[' or ']'
     * User defined types
     """
+    if get_origin(tp) is Annotated:
+        tp = get_args(tp)[0]
+
     # non-generic fallback
     origin = get_origin(tp)
     if not origin:
@@ -129,7 +132,7 @@ def tokenize_python_type(tp) -> list[Union[type, str]]:
             if top == RIGHT_BRACKET:
                 result.append(top)
                 continue
-            elif isinstance(top, str) or top in TYPE_MAPPING:
+            elif isinstance(top, str) or isinstance(top, int) or isinstance(top, float) or top in TYPE_MAPPING:
                 result.append(top)
                 current_type = top
                 continue
@@ -141,14 +144,13 @@ def tokenize_python_type(tp) -> list[Union[type, str]]:
         if origin is Annotated:
             current_type = get_args(current_type)[0]
             continue
-        elif origin in GENERICS:
+        if origin in GENERICS:
             result.append(origin)
             result.append(LEFT_BRACKET)
             stack.append(RIGHT_BRACKET)
             args = get_args(current_type)
             for arg in reversed(args):
                 stack.append(arg)
-            print(current_type, args, stack)
         elif origin in TYPE_MAPPING:
             result.append(origin)
         # generic fallback
@@ -215,7 +217,7 @@ def _build_generic_type(tp, children=None) -> str:
             if isinstance(child, str):
                 part = f"'{child}'"
             else:
-                part = child
+                part = str(child)
             parts.append(part)
         return ' | '.join(parts)
 
@@ -225,7 +227,9 @@ def build_type(tp) -> Tuple[str, List[Type]]:
     Build typescript type from python type.
     """
     tokens = tokenize_python_type(tp)
-    dependencies = [token for token in tokens if token not in TYPE_MAPPING_WITH_GENERIC_FALLBACK]
+    dependencies = [token for token in tokens if
+                    token not in TYPE_MAPPING_WITH_GENERIC_FALLBACK and
+                    not type(token) in TRIVIAL_TYPE_MAPPING]
     return _build_type(tokens), dependencies
 
 
@@ -296,7 +300,7 @@ def _get_serializer_field_type(field: Field) -> Tuple[str, Optional[Type]]:
             if isinstance(value, str):
                 part = f"'{value}'"
             else:
-                part = value
+                part = str(value)
             parts.append(part)
         field_type = ' | '.join(parts)
     elif isinstance(field, ManyRelatedField):
@@ -307,6 +311,10 @@ def _get_serializer_field_type(field: Field) -> Tuple[str, Optional[Type]]:
     elif isinstance(field, Serializer):
         field_type = get_serializer_prefix(type(field))
         dependency = field
+    else:
+        field_type = TYPESCRIPT_ANY
+    if field_type != TYPESCRIPT_ANY and field.allow_null:
+        field_type += TYPESCRIPT_NULLABLE
     return field_type, dependency
 
 
@@ -336,7 +344,7 @@ def get_serializer_field_type(field: Field) -> Tuple[str, list]:
             result = f'{{[index: string]: {result}}}'
         else:
             result = item
-    return result, sorted(list(dependencies))
+    return result, sorted(list(dependencies), key=lambda tp: tp.__name__)
 
 
 def build_interface_from_serializer(serializer_class: Type[Serializer],
@@ -349,9 +357,12 @@ def build_interface_from_serializer(serializer_class: Type[Serializer],
     interface_fields = []
     interface_dependencies = set()
     for field_name, field_instance in serializer.get_fields().items():
+        field_instance: Field
         field_type = type(field_instance)
         if field_type in DRF_FIELD_MAPPING:
             field_type = DRF_FIELD_MAPPING[field_type]
+            if field_instance.allow_null:
+                field_type += TYPESCRIPT_NULLABLE
         else:
             field_type, field_dependencies = get_serializer_field_type(field_instance)
             for dependency in field_dependencies:
@@ -363,6 +374,6 @@ def build_interface_from_serializer(serializer_class: Type[Serializer],
     if not interface_name:
         interface_name = get_serializer_prefix(serializer_class)
     return TypeScriptCode(type=TypeScriptCodeType.INTERFACE, source=serializer_class, name=interface_name,
-                          dependencies=sorted(list(interface_dependencies)),
+                          dependencies=sorted(list(interface_dependencies), key=lambda tp: tp.__name__),
                           content=INTERFACE_TEMPLATE.substitute(fields='\n'.join(interface_fields),
                                                                 name=interface_name))