[PD] Bug in lister (zexy) ?

[Cyrille.Damez at laposte.net]

I think I ran into a bug in zexy's lister, or at least a surprising behavior 
that should perhaps be documented. It seems that its output is reevaluated 
for each inlet it is connected to (ie if the left inlet of the lister has 
changed in between because of the depth-first traversal, its output will 
change). I suppose it's a bug because the [f] object doesn't behave this way.
I'm not sure my explanations are very clear, so I attached a small patch to 
demonstrate the issue.

-------------- next part --------------
#N canvas 109 76 880 283 10;
#X obj 575 158 l;
#X obj 607 158 list-rot 1;
#X obj 575 71 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
-1;
#X obj 575 218 list split 1;
#X floatatom 575 248 5 0 0 0 - - -;
#X obj 591 94 loadbang;
#X msg 591 124 1 2 3 4;
#X obj 575 188 t a a;
#X obj 322 71 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
-1;
#X floatatom 322 245 5 0 0 0 - - -;
#X obj 338 94 loadbang;
#X msg 338 124 1;
#X obj 322 158 f;
#X obj 354 158 + 1;
#X obj 44 158 l;
#X obj 76 158 list-rot 1;
#X obj 44 71 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
-1;
#X obj 44 215 list split 1;
#X floatatom 44 245 5 0 0 0 - - -;
#X obj 60 94 loadbang;
#X msg 60 124 1 2 3 4;
#X text 184 22 ... because this outputs 1 when first banged...;
#X text 436 39 ... I have to do this to fix it \, and I'm not sure
I should have to;
#X text 1 3 I expect this to output 1 instead of 2 when first banged...
;
#X connect 0 0 7 0;
#X connect 1 0 0 1;
#X connect 2 0 0 0;
#X connect 3 0 4 0;
#X connect 5 0 6 0;
#X connect 6 0 0 1;
#X connect 7 0 1 0;
#X connect 7 1 3 0;
#X connect 8 0 12 0;
#X connect 10 0 11 0;
#X connect 11 0 12 1;
#X connect 12 0 13 0;
#X connect 12 0 9 0;
#X connect 13 0 12 1;
#X connect 14 0 15 0;
#X connect 14 0 17 0;
#X connect 15 0 14 1;
#X connect 16 0 14 0;
#X connect 17 0 18 0;
#X connect 19 0 20 0;
#X connect 20 0 14 1;