Tuples cf. Expanded objects??

[Gary Stephenson]

From: Gary Stephenson <stephensong at iname.com>

>
> There is probably something in the the FAQ.  BAsically, tuples are stored
> more compactly and can be used as dictionary keys (because they ARE
> readonly).
>

How similar are Python's "Immutable Tuples"   to Eiffel's "Expanded objects". 
If
one
was to try to implement  immutable tuples in another language, would an
"expanded
objects" implementation be the best, or even appropriate?

many tias

gary