hash isn't quite the same thing as the general symbol table. From perlapi
PL_modglobal is a general purpose, interpreter global HV for use by extensions that need to keep information on a per-interpreter basis. In a pinch, it can also be used as a symbol table for extensions to share data among each other. It is a good idea to use keys prefixed by the package name of the extension that owns the data.
However, storing the addresses in scalar package globals accessed from C via get_sv() would be another approach and might actually be better.
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