dump env vars
ZEF_TEST_DEGREE=5
ZEF_FETCH_DEGREE=1
install [Acme::Cow6]
...
/tmp/whateverable/rakudo-moar/fe0e20c28859ea709eefad19af452c9d35dff20d/share/perl6/site/bin/zef
1.0.0
/tmp/whateverable/rakudo-moar/fe0e20c28859ea709eefad19af452c9d35dff20d/bin//raku
Welcome to Rakudo™ v2025.11.
Implementing the Raku® Programming Language v6.d.
Built on MoarVM version 2025.11.
===> Searching for: Acme::Cow6
===SORRY!=== Error while compiling /root/.sparky/.cache/wnvzqauboefjklcgityr.126/.sparrowdo/site#sources/29F9C09260812605B1B6F98E0B650BF1BE538476 (Acme::Cow::DragonAndCow:auth<cpan:ELIZABETH>:api<perl6>)
Could not find Acme::Cow:api<perl6> in:
    /tmp/.zef.1764076662.35211/1764076681.35211.3607.6181598518165
    /tmp/whateverable/rakudo-moar/fe0e20c28859ea709eefad19af452c9d35dff20d/share/perl6/site
    /tmp/whateverable/rakudo-moar/fe0e20c28859ea709eefad19af452c9d35dff20d/share/perl6/vendor
    /tmp/whateverable/rakudo-moar/fe0e20c28859ea709eefad19af452c9d35dff20d/share/perl6/core
    CompUnit::Repository::AbsolutePath<2642167583776>
    CompUnit::Repository::NQP<2642156220600>
    CompUnit::Repository::Perl5<2642156220640>
at /root/.sparky/.cache/wnvzqauboefjklcgityr.126/.sparrowdo/site#sources/29F9C09260812605B1B6F98E0B650BF1BE538476 (Acme::Cow::DragonAndCow:auth<cpan:ELIZABETH>:api<perl6>):3

===> Staging Acme::Cow6:ver<0.0.1>:auth<cpan:ELIZABETH>