types subdialect bugs fixed

BUGS.md

 Known bugs
 ==========
 
-+ in `qb.sql.types`
-		+ autocompletion is not working
-		+ `_repr_pretty` is not working
-		+ `dir` is not working

querybuilder/dialect.py

@@ -255,7 +255,7 @@ class Dialect(qbtools.AttrDict):
     def __repr__(self):
         return f"{type(self).__name__}.dialects[{self.fullname}]"
     def _pretty_repr_(self):
-        return f"{type(self).__name__}({self.fullname})〈{', '.join(self)}〉"
+        return f"{type(self).__name__}({self.fullname})〈{', '.join(map(str, self))}〉"
     def _repr_pretty_(self, printer, cycle):
         printer.text(self._pretty_repr_())
     def __iter__(self):

querybuilder/tools.py

@@ -55,7 +55,9 @@ class AttrDict(collections.abc.MutableMapping):
         else:
             super().__setattr__(attr, v)
     def __dir__(self):
-        return self.proxy_dict.keys()
+        return frozenset(self._reserved_names).union(
+            k for k in self.proxy_dict.keys() if isinstance(k, str) and k.isidentifier()
+        )
 
     #MutableMapping method
     def __getitem__(self, k):