I don't understand how thread safety in libSingular is an issue, Sage runs in a single thread after all. I thought the explanation is that Singular uses a slightly wonky optimization for small integer coefficients, roughly storing it in the place that would usually hold the pointer to the GMP struct. That of course helps a lot with cache locality, but also would certainly lead to a lot of tears if Sage were to internally use different GMP representations in different places.
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