You may like to read about the HEf_SVKEY flag in perlapi and in the perl source (hv.h and hv.c). It marks keys that are stored as SVs instead of raw strings (char *) inside the HV.

I have not investigated it deeply enough to known if it is usable for your purposes.

In reply to Re: Bidirectional lookup algorithm? (Updated: further info.) by salva
in thread Bidirectional lookup algorithm? (Updated: further info.) by BrowserUk

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