Jim Foltz posted a link above to another thread on this issue where one of the Trimble employees acknowledged the error and cause.
The cause is not specifically "\u", it is any of the normal escape sequences that Ruby (and many other programming languages) use in double-quoted strings.
There is not an actual Dynamic Components issue tracker (although I’ve politicked for one for years.)
I started an informal thread to post errors here in the Ruby API forum, but apparently the Trimble employees pay it no heed. I did post a notice to this issue in that thread, viz …