Fix missing path conversion

Author: George-Ogden

git/repo/base.py

@@ -219,7 +219,7 @@ def __init__(
             # Given how the tests are written, this seems more likely to catch Cygwin
             # git used from Windows than Windows git used from Cygwin. Therefore
             # changing to Cygwin-style paths is the relevant operation.
-            epath = cygpath(str(epath))
+            epath = cygpath(epath if isinstance(epath, str) else epath.__fspath__())
 
         epath = epath or path or os.getcwd()
         if not isinstance(epath, str):