Since 5.9.5 is basically a beta 5.10.0, I would actually make it a test version of a new perl5.10 package (so perl5.10-5.9.5-1).
Since 5.9.5 is 5.9.5, you should leave it as it is and not give it some whimsical name. Such is that which causes confusion. It is better to keep standards and names, rather than invent them.
When 5.10.0 is released, the package would be updated to perl5.10-5.10.0-1 and move to current.
When 5.10.0 is released then we have 5.10.0. I believe that keeping to the real names and not inventing others, which would simply serve to confuse people. This has been done before, with other packages and does beget confusion. Respect for a packages, name and version number, should be considered important. Or is there some fundamental reason why, one needs to use a different name other than the original. cheers,.
