Py3 fix

Cython/Compiler/Buffer.py

@@ -146,7 +146,7 @@ def analyse_buffer_options(globalpos, env, posargs, dictargs, defaults=None, nee
     for name, (value, pos) in dictargs.iteritems():
         if not name in buffer_options:
             raise CompileError(pos, ERR_BUF_OPTION_UNKNOWN % name)
-        options[name.encode("ASCII")] = value
+        options[name] = value
 
     for name, (value, pos) in zip(buffer_options, posargs):
         if not name in buffer_options:

Cython/Compiler/Nodes.py

@@ -735,6 +735,11 @@ class CBufferAccessTypeNode(CBaseTypeNode):
             self.keyword_args,
             base_type.buffer_defaults)
 
+        if sys.version_info[0] < 3:
+            # Py 2.x enforces byte strings as keyword arguments ...
+            options = dict([ (name.encode('ASCII'), value)
+                             for name, value in options.iteritems() ])
+
         self.type = PyrexTypes.BufferType(base_type, **options)
         return self.type