Comparision of nested directory vs file fails

Real world reproduction

Compare git worktrees, in main one .git is a directory, in additional one .git is a file.

Minimal reproduction

mkdir -p a/b
mkdir -p x
touch x/y
diffoscope a x

Actual behavior

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/diffoscope/main.py", line 752, in main
    sys.exit(run_diffoscope(parsed_args))
  File "/usr/lib/python3.10/site-packages/diffoscope/main.py", line 707, in run_diffoscope
    difference = compare_root_paths(path1, path2)
  File "/usr/lib/python3.10/site-packages/diffoscope/comparators/utils/compare.py", line 63, in compare_root_paths
    return compare_directories(path1, path2)
  File "/usr/lib/python3.10/site-packages/diffoscope/comparators/directory.py", line 208, in compare_directories
    return FilesystemDirectory(path1).compare(FilesystemDirectory(path2))
  File "/usr/lib/python3.10/site-packages/diffoscope/comparators/directory.py", line 276, in compare
    differences.extend(my_container.compare(other_container))
  File "/usr/lib/python3.10/site-packages/diffoscope/comparators/utils/container.py", line 191, in compare_pair
    difference = compare_files(
  File "/usr/lib/python3.10/site-packages/diffoscope/comparators/utils/compare.py", line 124, in compare_files
    return file1.compare_bytes(file2, source)
AttributeError: 'FilesystemDirectory' object has no attribute 'compare_bytes'

Expected behavior

There is some diff, like a non-nested comparision: diffoscope a/b x/y of minimal case, that is

--- a/b
+++ x/y
@@ -1 +1 @@
-type: directory
+type: file