Allow for FiniteDatetimeRange to be considered as "half-open"

Author: feds01

xocto/ranges.py

@@ -1203,4 +1203,4 @@ def _is_datetime_range(value: Any) -> bool:
 # Subscripted generics may not be used with isinstance directly.
 # TODO: A TypeGuard would be nicer, once we drop Python 3.9.
 def _is_half_finite_datetime_range(value: Any) -> bool:
-    return _is_datetime_range(value) and isinstance(value, HalfFiniteRange)
+    return _is_datetime_range(value) or isinstance(value, HalfFiniteRange)