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Constructor and startup
  new()

    Creates and returns a new WWW::Mechanize object, hereafter referred to
    as the 'agent'.

        my $mech = WWW::Mechanize->new()

    The constructor for WWW::Mechanize overrides two of the parms to the
    LWP::UserAgent constructor:

        agent => "WWW-Mechanize/#.##"
        cookie_jar => {}    # an empty, memory-only HTTP::Cookies object
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