Binary package “libbest-perl” in ubuntu eoan

fallbackable module loader attempts to load Perl modules from a list, stopping at the first
 successful load and failing only if no alternative was found.
 Often there are several possible providers of some functionality your program
 needs, but you don't know which is available at the run site. For example,
 one of the modules may be implemented with XS, or not in the core Perl
 distribution and thus not necessarily installed. With, this can
 be as simple as:
  use Best qw/YAML::Syck YAML/;