Remove the u() unicode function

jedi/_compatibility.py

@@ -134,18 +134,7 @@ class ImplicitNSInfo(object):
         self.paths = paths
 
 
-def u(string, errors='strict'):
-    """Cast to unicode DAMMIT!
-    Written because Python2 repr always implicitly casts to a string, so we
-    have to cast back to a unicode (and we now that we always deal with valid
-    unicode, because we check that in the beginning).
-    """
-    if isinstance(string, bytes):
-        return str(string, encoding='UTF-8', errors=errors)
-    return string
-
-
-def cast_path(obj):
+def cast_path(string):
     """
     Take a bytes or str path and cast it to unicode.
 
@@ -156,7 +145,9 @@ def cast_path(obj):
     Since this just really complicates everything and Python 2.7 will be EOL
     soon anyway, just go with always strings.
     """
-    return u(obj, errors='replace')
+    if isinstance(string, bytes):
+        return str(string, encoding='UTF-8', errors='replace')
+    return string
 
 
 def pickle_load(file):