why gem install always use the --force option?

[Athenas Jimenez <athenasjim@xxxxxxxxx>]

Hello, 

This is basically my question, why ruby gems packages always use --force option during installation?

(from http://pkgs.fedoraproject.org/cgit/ruby.git/tree/macros.rubygems)

gem install \\\
        -V \\\
        --local \\\
        --install-dir %{-d*}%{!?-d:.%{gem_dir}} \\\
        --bindir .%{_bindir} \\\
        --force \\\
        --document=ri,rdoc \\\
        %{-n*}%{!?-n:%{gem_name}-%{version}.gem} \
%{nil}

Thanks for your help 

Athenas

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