Bruno Le Floch wrote:

Note that the version test using \ifdim is unsafe because values are
rounded to a certain number of scaled points before being compared.


Argh, Scheisse.  Many thanks for the warning, Bruno — will amend code 
accordingly.   And I suppose I ought to add in \XeTeXversion as well — can't 
assume that it will remain at zero in perpetuity.
Philip Taylor

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