Making immutable instances

[Ben Finney]

Mike Meyer <mwm at mired.org> wrote:
> Lots of people seem to want immutable instances. Nobody seems to
> have a use case for them.

Perhaps you missed my release announcement of the 'enum' package that
explains why Enum instances are immutable.

-- 
 \        "Hanging one scoundrel, it appears, does not deter the next. |
  `\     Well, what of it? The first one is at least disposed of."  -- |
_o__)                                                 Henry L. Mencken |
Ben Finney