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##### Floating-Point Notation

    boost::cnv::charconv cnv;

    BOOST_TEST(  "-3.14159" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::fixed)(arg::precision = 5)).value());
    BOOST_TEST("-3.142e+00" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::scientific)(arg::precision = 3)).value());
    BOOST_TEST("-1.9220p+1" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::hex)(arg::precision = 4)).value());