Fix conflict_set.py bug, and add full inner words test

Apparently all bytes were 0

test_conflict_set.py

@@ -1,14 +1,21 @@
 from conflict_set import *
 
 
+build_dir = None
+
+
 class DebugConflictSet:
     """
     Bisimulates the skip list and radix tree conflict sets for testing purposes
     """
 
     def __init__(self, version: int = 0) -> None:
-        self.skip_list = ConflictSet(version, implementation="skip_list")
-        self.radix_tree = ConflictSet(version, implementation="radix_tree")
+        self.skip_list = ConflictSet(
+            version, build_dir=build_dir, implementation="skip_list"
+        )
+        self.radix_tree = ConflictSet(
+            version, build_dir=build_dir, implementation="radix_tree"
+        )
 
     def addWrites(self, version: int, *writes: WriteRange):
         self.skip_list.addWrites(version, *writes)
@@ -49,6 +56,16 @@ def test_conflict_set():
         assert cs.check(read(0, key)) == [Result.TOO_OLD]
 
 
+def test_inner_full_words():
+    with DebugConflictSet() as cs:
+        cs.addWrites(1, write(b"\x3f\x61"), write(b"\x81\x61"))
+        writes = []
+        for i in range(0x40, 0x81):
+            writes.append(write(bytes([i, 0x61])))
+        cs.addWrites(2, *writes)
+        cs.check(read(1, b"\x21", b"\xc2"))
+
+
 if __name__ == "__main__":
     # budget "pytest" for ctest integration without pulling in a dependency. You can of course still use pytest in local development.
     import argparse
@@ -61,6 +78,7 @@ if __name__ == "__main__":
     list_parser = subparsers.add_parser("list")
     test_parser = subparsers.add_parser("test")
     test_parser.add_argument("test")
+    test_parser.add_argument("--build-dir")
 
     args = parser.parse_args()
 
@@ -74,4 +92,5 @@ if __name__ == "__main__":
             )
         )
     elif args.command == "test":
+        build_dir = args.build_dir
         globals()["test_" + args.test]()