Fix Bound for empty BoundedSet.max/min (nan)

qutil/domains.py

@@ -44,7 +44,8 @@ class Bound(Generic[_RealT]):
             if self.integral:
                 try:
                     return self.cast_lower(lower)
-                except OverflowError:
+                except (OverflowError, ValueError):
+                    # inf or nan
                     return lower
             return lower
         if self._name.startswith('_upper'):
@@ -52,7 +53,8 @@ class Bound(Generic[_RealT]):
             if self.integral:
                 try:
                     return self.cast_upper(upper)
-                except OverflowError:
+                except (OverflowError, ValueError):
+                    # inf or nan
                     return upper
             return upper
         raise NameError('Bound descriptor instance name should start with lower or upper')