Un-simplify

Author: StanFromIreland

Doc/library/codecs.rst

@@ -56,8 +56,9 @@ any codec:
 .. function:: charmap_build(string)
 
    Return a mapping suitable for decoding a custom single-byte encoding.
-   Given a string *string* of up to 256 characters representing an encoding
-   table, returns a dictionary mapping character ordinals to byte values.
+   Given a :class:`str` *string* of up to 256 characters representing an
+   encoding table, returns either a compact internal mapping object or a
+   dictionary mapping character ordinals to byte values.
    Raises a :exc:`TypeError` on invalid input.
 
 The full details for each codec can also be looked up directly: