bug in ellpointtoz?

[Jeffrey Stopple <stopple@math.ucsb.edu>]

Reading GPRC: gprc ...Done.

                                  2.0.12 alpha
                                PowerPC version
                (readline disabled, extended help not available)

                           Copyright (C) 1989-1998 by
          C. Batut, K. Belabas, D. Bernardi, H. Cohen and M. Olivier.

Type ? for help, \q to quit.
Type ?12 for how to get moral (and possibly technical) support.

   realprecision = 28 significant digits
   seriesprecision = 16 significant terms
   format = g0.28

parisize = 80000000, primelimit = 2000000
? e=ellinit([0,1,1,-2,0])
%1 = [0, 1, 1, -2, 0, 4, -4, 1, -3, 112, -856, 389, 1404928/389, 
[0.9048929600637101729532368496, 0.1354092402217534448906525937, 
-2.040302200285463617843889443]~, 2.490212560855055075321357791, 
1.971737701551648204422407698*I, -0.5487442089818677019469720749, 
-1.696068988382761177923670948*I, 4.910045991115390176268332641]
? p=[-2,0]
%2 = [-2, 0]
? ellisoncurve(e,p)
%3 = 1
? z=ellpointtoz(e,p)
%4 = 2.410476521732778758618118230 + 0.9858688507758241022112038490*I
? ellztopoint(e,z)
%5 = [-1.999999999999999999999999999 + 2.524354896508157253000000000 
E-29*I, -1.000000000000000000000000000 - 
2.903008130379021167000000000 E-28*I]
? \q
Good bye!