py3: stop normalizing .encode()/.decode() arguments to unicode

Now that we don't byte transform string literals, we no longer need
this transform.

While we're here, we also drop some superfluous u'' prefix in existing
callers.

Differential Revision: https://phab.mercurial-scm.org/D7011

contrib/testparseutil.py

@@ -49,7 +49,7 b' if ispy3:'
     def sysstr(s):
         if isinstance(s, builtins.str):
             return s
-        return s.decode(u'latin-1')
+        return s.decode('latin-1')
 
     def opentext(f):
         return open(f, 'r')

hgext/lfs/blobstore.py

@@ -394,7 +394,7 b' class _gitlfsremote(object):'
 
         def encodestr(x):
             if isinstance(x, pycompat.unicode):
-                return x.encode(u'utf-8')
+                return x.encode('utf-8')
             return x
 
         return pycompat.rapply(encodestr, response)

mercurial/__init__.py

@@ -166,14 +166,6 b' if sys.version_info[0] >= 3:'
                     if arg1idx is not None:
                         _ensureunicode(arg1idx)
 
-                # .encode() and .decode() on str/bytes/unicode don't accept
-                # byte strings on Python 3.
-                elif fn in ('encode', 'decode') and _isop(i - 1, '.'):
-                    for argn in range(2):
-                        argidx = _findargnofcall(argn)
-                        if argidx is not None:
-                            _ensureunicode(argidx)
-
                 # It changes iteritems/values to items/values as they are not
                 # present in Python 3 world.
                 elif fn in ('iteritems', 'itervalues') and not (
@@ -190,7 +182,7 b' if sys.version_info[0] >= 3:'
     # ``replacetoken`` or any mechanism that changes semantics of module
     # loading is changed. Otherwise cached bytecode may get loaded without
     # the new transformation mechanisms applied.
-    BYTECODEHEADER = b'HG\x00\x12'
+    BYTECODEHEADER = b'HG\x00\x13'
 
     class hgloader(importlib.machinery.SourceFileLoader):
         """Custom module loader that transforms source code.

mercurial/pycompat.py

@@ -206,7 +206,7 b' if ispy3:'
             ) and not hasattr(  # hasattr-py3-only
                 s, u'__bytes__'
             ):
-                s = str(s).encode(u'ascii')
+                s = str(s).encode('ascii')
             return bytes.__new__(cls, s)
 
         def __getitem__(self, key):
@@ -237,7 +237,7 b' if ispy3:'
         This never raises UnicodeEncodeError, but only ASCII characters
         can be round-trip by sysstr(sysbytes(s)).
         """
-        return s.encode(u'utf-8')
+        return s.encode('utf-8')
 
     def sysstr(s):
         """Return a keyword str to be passed to Python functions such as
@@ -249,18 +249,18 b' if ispy3:'
         """
         if isinstance(s, builtins.str):
             return s
-        return s.decode(u'latin-1')
+        return s.decode('latin-1')
 
     def strurl(url):
         """Converts a bytes url back to str"""
         if isinstance(url, bytes):
-            return url.decode(u'ascii')
+            return url.decode('ascii')
         return url
 
     def bytesurl(url):
         """Converts a str url to bytes by encoding in ascii"""
         if isinstance(url, str):
-            return url.encode(u'ascii')
+            return url.encode('ascii')
         return url
 
     def raisewithtb(exc, tb):