--with-recommends, --with-suggests
EXPERIMENTAL: Installs dependencies declared as recommends and suggests respectively, per META spec. When these dependencies fail to install, cpanm continues the installation, since they're just recommendation/suggestion.

Enabling this could potentially make a circular dependency for a few modules on CPAN, when recommends adds a module that recommends back the module in return.

There's also --without-recommend and --without-suggests to override the default decision made earlier in PERL_CPANM_OPT.

Defaults to false for both.