vcs p[rojection cannot be changed after initial type is set

[doutriaux1]

p = vcs.createprojection()
p.type="polar"
p.list()

---------- Projection (Proj) member (attribute) listings ----------
('secondary method =', 'Proj')
('name =', '__projection_430123113927722')
('type =', 'polar stereographic')
('smajor', '=', 1e+20)
('sminor', '=', 1e+20)
('centerlongitude', '=', 1e+20)
('truescale', '=', 1e+20)
('falseeasting', '=', 1e+20)
('falsenorthing', '=', 1e+20)

p.type=-3
p.list()

---------- Projection (Proj) member (attribute) listings ----------
('secondary method =', 'Proj')
('name =', '__projection_430123113927722')
('type =', 'polar (non gctp)')

p.type="polar"
p.list()

---------- Projection (Proj) member (attribute) listings ----------
('secondary method =', 'Proj')
('name =', '__projection_430123113927722')
('type =', 'polar (non gctp)')