Revision history for Heap-PQ

0.06  2026-07-07
      - guard PUSH_MULTICALL / dMULTICALL /
        MULTICALL / POP_MULTICALL behind PERL_VERSION_GE(5,11,0). 

0.05  2026-04-28
      - Fix stack bug in pp_nv_delete
      - Fix Perl_custom_op_register fallback in xop_compat.h

0.04  2026-04-27
      - Gate the call-checker optree rewrites behind
        PERL_VERSION_GE(5,16,0). pad_alloc()

0.03  2026-04-08
      - Fix newUNOP(OP_CUSTOM)/newBINOP(OP_CUSTOM) assertion failure on
        debug perl builds (5.16, 5.18). Create ops as OP_NULL first,
        then set op_type to OP_CUSTOM.
      - Fix stack pointer assertion (rpp_popfree_to_NN) on perl 5.42+ with
        reference-counted stack. Add PUTBACK after consuming args and
        SPAGAIN before pushing results in search/delete custom ops.

0.02  2026-04-07
      - Optimise the comparison function to be MULTICALL and use $a/$b instead of @_
      - Extend to be able to pass a key into the comparison function to stay within C where possible, removing the perl callback overhead entirely

0.01  2026-04-06
      - Initial release, ported from Ancient distribution.
