polynomial arithmetic feature?

[Michael Somos <somos@grail.cba.csuohio.edu>]

pari-dev,

? ( (x+y+1)*z*(x+y)/y ) / ( z*(x+y)/y ) 
%1 = z/z*x + (y + 1)

Is it supposed to do that? The coefficient of x is z/z and not 1.
Simplify does not simplify it. The result does = x+y+1 and I can
do further arithmetic with it, but perhaps this is a bug instead.
Shalom, Michael