Dear all, After some years of work, Burcin and others have finally managed to get #9880 into a state where we can hope to merge it quite soon. The problem solved there is that the order used by pynac internally (and for printing) was not a Strict Weak Ordering and caused segfaults and incoherencies in some corner cases (the version currently included in Sage still has this problem although you will probably not encounter it under normal usage of symbolic stuff). The solution was to switch back to the legacy GiNaC ordering for internal use (which is seemingly a SWO even though the converse is stated in GiNaC docs, at least we did not manage to produce segfaults or bad outputs even under a lot of stress) and modify the print ordering so that it is also a SWO (note that the GiNaC ordering cannot be used, it is fast, but somewhat random and does not fit well with other oredering used in Sage, let's say for multivariate polynomials). Although we strived to get a print ordering which fits well into Sage, what we got is sensibly different from what pynac offered before (and which was broken). And obviously, changing the print ordering for symbolic stuff changes the output of lots of doctests, which include doctests in various books included into Sage's documentation. Whence this message to get feedback from the authors of these books, and others as well.
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