could not use an installation_name like 'perl-5.16.3'

I have installed perl 5.16.3 by the command "plenv install 5.16.3 --as perl-5.16.3".
As expected, perl was installed in ~/.plenv/versions/perl-5.16.3.

But "plenv global perl-5.16.3" does not work, because the global option eliminate 'perl-' from the installation name.

I know, this is unexpected usage.