V6.3-009 GTM-9115 test case

Release note says:

The code invoked for longer radix conversions has somewhat faster execution, and the other radix conversion routines (%DH, %DO, %HD, %HO, %OD, %OH) have spelled out keywords. Those other routines now have a single working code block in an attempt to make them as fast as possible, given their documented behavior. Note that if your application limits the input(s) and performance is important, you can get some speed improvement by eliminating behavior on which your code does not rely. While the conversions work for very long values, the performance degrades with length and may be impractical beyond some point. Previously, the longer conversion code had more abstraction, and the other routines used two code blocks, rather than one. (GTM-9115)