sub get_function_names_from_package {
        no strict 'refs';
        my $pkg = shift || caller;
        my $symtab = *{ $pkg . "::" }{HASH};
        grep *$_{CODE},          # drop symbols w/o code
            map  $pkg."::$_",    # fully qualify
            grep !/^_|^[_A-Z]$/, # drop _underscored & ALL_CAPS
            keys %$symtab;       # get all symbols for package
    }