The QL CET file 16-03.ps exercises the Metrics optional dictionary in a font. The 2 and 4 element array forms of this test do not render correctly (or convert to PDF correctly) because Ghostscript appears to ignore the custom values for the Left Side-Bearing from the array.
Current master branch has progressions and regressions compared to v. 9.50 v.9.50 v.9.54 pdfwr 9.50 pdfwr 9.54 one number, Wmode 0 correct, correct correct, correct two numbers, Wmode 0 incorrect, correct correct, correct four numbers, Wmode 0 incorrect, correct correct, correct four numbers, Wmode 1 correct, incorrect incorrect, incorrect