CSSJanus version 1.3.0 has a flipping bug.
Input:
/*@noflip*/ .selector-ltr[ data-foo='bar' ]:empty { border-left: 10px none; border-right: 0 none; }
Expected output:
.selector-ltr[ data-foo='bar' ]:empty { border-left: 10px none; border-right: 0 none; }
Actual output:
.selector-ltr[ data-foo='bar' ]:empty { border-left: 10px none; border-left: 0 none; }
CSSJanus version 2.0.0 fixes this bug.