Fix vec_proxy_compare() example - #1977
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When introducing custom implementation of
vec_proxy_compare(), the examplerational(2, 4) < rational(2, 3)was used as a case where we would get aFALSEresult. This actually renderedTRUE, because of fallback tovec_proxy_equal(), which uses the irreducible fraction, so it was actually equivalent torational(1, 2) < rational(2, 3), which isTRUEeven lexicographically. This example was thus misleading, and I changed it torational(2, 5) < rational(2, 3), which correctly showcases the problem.I also added an additional paragraph warning about floating point precision when using the double representation as a proxy.