Per LuaTeX manual, \Umathradicalrule is equivalent to OpenType RadicalRuleThickness but the comment in page 111 doesn't seem right to me; RadicalRuleThickness, from its name, is the thickness radical rule and thus it should default to default_rule_thickness as TeX82 does and as recommended in OpenType MATH specification too.
In short, \Umathradicalrule should be the same as, say, \Umathoverbarrule but it isn't: \the\Umathradicalrule\textstyle : \the\Umathoverbarrule\textstyle \bye Regards, Khaled -- Khaled Hosny Arabic localiser and member of Arabeyes.org team Free font developer
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