Directories are objects too

Let's modify one file and record the resulting tree

Original tree:

         100644 blob 3a6f56f8a15f5f96411c267a7428fcfeff6f9bcd    foo
         040000 tree e79566ab21a03dfac3fb4b479b24e3d9ff379d29    doc
         100644 blob 22aa6ff4684a3080367c7bb5ec366fb3bd0364c6    bar

New tree with modified foo:

         100644 blob 6c88cdb22deeeb871ad083cdbad17d515acd9181    foo
         040000 tree e79566ab21a03dfac3fb4b479b24e3d9ff379d29    doc
         100644 blob 22aa6ff4684a3080367c7bb5ec366fb3bd0364c6    bar

Since the resulting tree is different, it will have a different hash

So it's a different object