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Group all the "global" variables into a hashref $globals. This variable will be the return value of init_globals() within pod2html(), will be passed through, and augmented by, parse_command_line() and then used through the balance of pod2html(). In essence, so far this is just a renaming of variables. Remove declarations of superseded variables. Pass $globals to get_cache(), cache_key() and load_cache().
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