note syphilis <I>\$ say 3602879701896397/36028797018963968 == 0.100000000000000006; <br>True</I><br><br> Have they changed the spec ? <c> > say 3602879701896397/36028797018963968 == 0.100000000000000006; False </c> I have: <c> \$ raku -v Welcome to Rakudo(tm) v2021.03. Implementing the Raku(tm) programming language v6.d. Built on MoarVM version 2021.03. </c> If the RHS is a rational, then it's fairly easy to show that 3602879701896397/36028797018963968 != 100000000000000006/1000000000000000000. <br>(A/B == C/D if and only if A*D == B*C. In this case, A*D ends in zero and B*C ends in 8 so the equivalence cannot possibly hold.) <br><br>If the RHS is a double, then it's correct that 3602879701896397/36028797018963968 == 0.100000000000000006. <br>However, the 3 doubles assigned (respectively) the 3 values 0.100000000000000006, 0.10000000000000001 and 0.1 are all exactly the same. So we find, as expected: <c> > say 3602879701896397/36028797018963968 == 0.100000000000000006e0; True > say 3602879701896397/36028797018963968 == 0.10000000000000001e0; True > say 3602879701896397/36028797018963968 == 0.1e0; True </c> I've long been curious about the mindset that has created the rational/double arithmetic on raku, and I had thought (hoped) it might be a simple task to see how it all fits together. <br> Alas no, and I'm starting to see that I'm going to have to locate and work through the relevant documentation if I ever want to understand it. <br><br>Cheers,<br>Rob 11130768 11130786