Leading Whitespace Characters

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##### Leading Whitespace Characters

    boost::cnv::strtol cnv;

    BOOST_TEST(-1 == convert<int>( " 12", cnv(arg::skipws = false)).value_or(-1));
    BOOST_TEST(12 == convert<int>( " 12", cnv(arg::skipws =  true)).value_or(-1));

    BOOST_TEST(-1 == convert<int>(L" 12", cnv(arg::skipws = false)).value_or(-1));
    BOOST_TEST(12 == convert<int>(L" 12", cnv(arg::skipws =  true)).value_or(-1));