how do bug fixes get incorporated to packages?
I'm confused how a bug fix gets to a compiled package.
In this case the last entry in "Debian Bug report logs - #520406" starts
We believe that the bug you reported is fixed in the latest version of
libdbd-mysql-perl, which is due to be installed in the Debian FTP archive:
Is this available to users now? The source at debian.org is still listed
as "Version: 4.007-1".