You didn't retrieve any information from the data structure, so you didn't test it at all. Try this: 

perl -Mv5.14  -MJudy::L=Get,Set -e'
   my $i = 1<<63;
   my $j = -$i;

   my $judy;

   Set( $judy, $i, 4 );
   Set( $judy, $j, 5 );

   say( ( Get( $judy, $i ) )[1] );
   say( ( Get( $judy, $j ) )[1] );
'

[download]

If you get different values, I was wrong. If you get the same value, each negative value is considered to the same as a very large positive value.

Without the hack, it outputs 5 twice. I suspect the hack only silences the warning.

Of course not.

No, it isn't obvious that the keys are 65 bits (or larger) in size. In fact, they pretty obviously aren't.

In reply to Re^6: Unsigned 64-bit integer as Judy key by ikegami
in thread Unsigned 64-bit integer as Judy key by Anonymous Monk

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