how does bugzilla detect the modules versions?

[Tosh, Michael J]

Quoting Tsahi Asher:
> excuse my ignorance in perl, but what does the
> 
> $vnum = eval { $module->VERSION } || -1;

Attempt to find the global variable, VERSION, of the object loaded into
$module.  If successful store that value in the variable $vnum,
otherwise store -1 in that variable.

Basically, the $module Object needs to have a global VERSION defined.
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