However , values may be references to arrays or other hashes , and the standard Perl module Tie : : RefHash enables hashes to be used with reference keys .
Perl hashes are flat : keys are strings and values are scalars .
Scalars may be scalars to arrays or other hashes , and the standard Perl module Tie : : RefHash enables hashes to be used with reference keys .
Perl hashes are flat : keys are strings and values are scalars .