Wrong border compressed result when with shorthand-border

[shinken008]

.no-border {
    border: 0 solid transparent;
    border-width: 1px;
}

.red-border {
    border: 0 solid red;
    border-width: 1px;
}

will be transformed:

.no-border,.red-border {
    border: 0 solid transparent;
    border-width: 1px
}

.red-border {
    border: 0 solid red
}

.red-border's property border-width is gone.

expect

but