sealed.pm implements dougm’s original patch to compile method lookups for typed lexicals:

https://www.perl.com/pub/2000/06/dougpatch.html/

v5.1.5 on CPAN resolves longstanding reentrancy issues.

Internally sealed always relied on an undocumented method in B::Generate to construct the replacement B::PADOP opcode, but internally it’s invoking newPADOP, which leaves the associated padname unaddressed.

This causes segfaults in Perl_pad_push reliably, when it indexes that padname element.

In v5.1.5, the padname gets created by an XS subroutine, which does the needful.

submitted by /u/joesuf4
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Notes on Doug's Method Lookup Patch

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