From Andrea Vacondio in the mailing list:
Hi, we came across this case where we are basically cloning outline items
where the original outline title is a UTF16BE encoded text string
containing the value 00A0 (non break space). We later use the string to
assign the title in a new outline item and the A0 is recognised as a € sign.
Here is a simple test:
If you look at the node dictionary you'll see that the title value is
The cause is that in the initialization of PDFDocEncoding it was forgotten that there are "holes" in the 0..255 sequence. I'll add that and a test.