I understood that the OP considered his symbolic references an advantage because a user could add new subroutines without modifying the original script. My point is that it is unlikely that this is possible. The additional effort to add a hard reference to a dispatch table is insignificant if you have to modify the script anyway.
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The sub routines will all be in a module which will obviously need a 'use' statement to reference it, so if adding a new sub routine to the hash table, only the called module will need to be updated.
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