oldk1331 wrote:
> > changes order in which map processes elements.  AFAICS classic version 
> > which keeps pointer to the last element does not have this problem.
> 
> I don't understand, what do you mean? what pointer?

You propose:

[| ,    |]
 |      --> rear
 |       
 v
 front

with separate front and rear.

Classic:

[|, |]
 |  |
 |  \_______________
 |                  \
 v                  v
[e1, |]   [e2, |]   [en, nil]
     |     ^   ......
     \_____/


-- 
                              Waldek Hebisch

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