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use constant {
    zed=>0,
...
    two=>2,
};
use constant repos=>(qw(oss non-oss debug));

use constant {
    zed=>0,
...
    # to create a constant array, it has to be in a separate `use cons
+tant` line; 
    # do not try to optimize this back into the `use constant {...}` b
+ecause it won't work!  
    # Really, I mean it!