missing '.' in $*REPO

gistfile1.txt

1: $*REPO contains '.' and 'lib'

$ ./perl6-m -e 'use lib <. lib>; say $*REPO.repo-chain.map(*.Str).join("\n").indent(4)'
    /p6dir/lib
    /p6dir
    /home/christian/.perl6/2015.11-550-g9e53fa9
    /p6dir/install/share/perl6/site
    /p6dir/install/share/perl6/vendor
    /p6dir/install/share/perl6
    CompUnit::Repository::NQP<140600819436888>
    CompUnit::Repository::Perl5<140600819434520>

2: $*REPO contains 'lib' -- but not '.'

$ ./perl6-m -Ilib -e 'use lib <. lib>; say $*REPO.repo-chain.map(*.Str).join("\n").indent(4)'
    /p6dir/lib
    /home/christian/.perl6/2015.11-550-g9e53fa9
    /p6dir/install/share/perl6/site
    /p6dir/install/share/perl6/vendor
    /p6dir/install/share/perl6
    CompUnit::Repository::NQP<140486179291368>
    CompUnit::Repository::Perl5<140486179289000>

3: $*REPO contains 'lib', '.' and 'foobar'

$ ./perl6-m -Ifoobar -e 'use lib <. lib>; say $*REPO.repo-chain.map(*.Str).join("\n").indent(4)'
    /p6dir/lib
    /p6dir
    /p6dir/foobar
    /home/christian/.perl6/2015.11-550-g9e53fa9
    /p6dir/install/share/perl6/site
    /p6dir/install/share/perl6/vendor
    /p6dir/install/share/perl6
    CompUnit::Repository::NQP<140672153235688>
    CompUnit::Repository::Perl5<140672153233320>