Fix range lookup includes incorrect values.

Author: WaVEV

django_mongodb/base.py

@@ -102,7 +102,12 @@ def _isnull_operator(a, b):
         "lte": lambda a, b: {"$lte": [a, b]},
         "in": lambda a, b: {"$in": [a, b]},
         "isnull": _isnull_operator,
-        "range": lambda a, b: {"$and": [{"$gte": [a, b[0]]}, {"$lte": [a, b[1]]}]},
+        "range": lambda a, b: {
+            "$and": [
+                {"$or": [DatabaseWrapper._isnull_operator(b[0], True), {"$gte": [a, b[0]]}]},
+                {"$or": [DatabaseWrapper._isnull_operator(b[1], True), {"$lte": [a, b[1]]}]},
+            ]
+        },
         "iexact": lambda a, b: regex_match(a, ("^", b, {"$literal": "$"}), insensitive=True),
         "startswith": lambda a, b: regex_match(a, ("^", b)),
         "istartswith": lambda a, b: regex_match(a, ("^", b), insensitive=True),

django_mongodb/features.py

@@ -57,8 +57,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "db_functions.datetime.test_extract_trunc.DateFunctionWithTimeZoneTests.test_trunc_timezone_applied_before_truncation",
         # Length of null considered zero rather than null.
         "db_functions.text.test_length.LengthTests.test_basic",
-        # range lookup includes incorrect values.
-        "expressions.tests.IterableLookupInnerExpressionsTests.test_expressions_in_lookups_join_choice",
         # Unexpected alias_refcount in alias_map.
         "queries.tests.Queries1Tests.test_order_by_tables",
         # The $sum aggregation returns 0 instead of None for null.