Hi Looking at the changes for libyaml-syck-perl it has to do with the following:
https://rt.cpan.org/Ticket/Display.html?id=50227
and the changes in libyaml-syck-perl:
* RT 50227 - Not quoting strings when data has been sorted numerically
before being passed to JSON::Syck::Dump
Thus with
----(snip)--------------------------------------------------------------
--- libdevel-ebug-perl-0.49.orig/t/pad.t
+++ libdevel-ebug-perl-0.49/t/pad.t
@@ -83,5 +83,5 @@ is($pad->{'$first'}, '{...}');
$ebug->run;
$pad = $ebug->pad_human;
-is($pad->{'$first'}, '"$koremutake"');
+is($pad->{'$first'}, '$koremutake');
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