0 valued margin or padding are discarded while margin:0px or margin:0 1px or margin:1px 0 are not

[GoogleCodeExporter]

.popuptitle a
{
margin:0; 
padding:0px;
}

What is the expected output? 
.popuptitle a
{
margin:0; 
padding:0px;
}

or
.popuptitle a
{
margin:0px; 
padding:0px;
}

or
.popuptitle a
{
margin:0; 
padding:0;
}

What do you see instead?
.popuptitle a
{
padding:0px;
}

What version of the product are you using? 
3.2

On what operating system?
linux ubuntu 10.10

Original issue reported on code.google.com by vincent....@gmail.com on 30 May 2011 at 8:38

[GoogleCodeExporter]

This is fixed as of now in https://github.com/richthegeek/phamlp

Original comment by richtheg...@gmail.com on 7 Feb 2012 at 5:02