RDBC-999 Fix Python 3.14 issue

Author: poissoncorp

ravendb/documents/session/document_session_operations/in_memory_document_session_operations.py

@@ -177,14 +177,14 @@ def __contains__(self, item):
             try:
                 return item in self.__documents_by_entity_hashable
             except TypeError as e:
-                if str(e.args[0]).startswith("unhashable type"):
+                if "unhashable type" in str(e.args[0]):
                     return item in self.__documents_by_entity_unhashable
                 raise e
         self.__create_on_before_store_documents_by_entity_if_needed()
         try:
             return item in self.__on_before_store_documents_by_entity_hashable
         except TypeError as e:
-            if str(e.args[0]).startswith("unhashable type"):
+            if "unhashable type" in str(e.args[0]):
                 return item in self.__documents_by_entity_unhashable
             raise e
 
@@ -193,7 +193,7 @@ def __setitem__(self, key, value):
             try:
                 self.__documents_by_entity_hashable[key] = value
             except TypeError as e:
-                if str(e.args[0]).startswith("unhashable type"):
+                if "unhashable type" in str(e.args[0]):
                     self.__documents_by_entity_unhashable[key] = value
                     return
                 raise e
@@ -202,7 +202,7 @@ def __setitem__(self, key, value):
         try:
             self.__on_before_store_documents_by_entity_hashable[key] = value
         except TypeError as e:
-            if str(e.args[0]).startswith("unhashable type"):
+            if "unhashable type" in str(e.args[0]):
                 self.__on_before_store_documents_by_entity_unhashable[key] = value
                 return
             raise e