Thanks everyone for answers.

https://metacpan.org/release/JJORE/Judy-0.41/source/typemap

oh, but that explains it all. The argument is treated by default and by design as signed IV. Which is a bug in Perl Judy distribution, as very strange as it is. I understand it is "0-dot-something" version, but it's strange and sad this wasn't noticed in 10 years. Conditionals starting from line #88 should first check if $arg is an UV.

For example:

>perl -MDevel::Peek -E "Dump 1<<63"
SV = IV(0x3e42b48) at 0x3e42b58
  REFCNT = 1
  FLAGS = (PADTMP,IOK,READONLY,PROTECT,pIOK,IsUV)
  UV = 9223372036854775808

[download]

How can I check for IsUV flag in XS? Can't find it in perlguts. Hopefully, this easy fix in typemap file won't break anything else.

In reply to Re^2: Unsigned 64-bit integer as Judy key by Anonymous Monk
in thread Unsigned 64-bit integer as Judy key by Anonymous Monk

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