<div dir="ltr">Hi<div><br></div><div>How \boxdir primitive work? if I give \boxdir TRT, I get error and luatex expects the argument to be a number. I tried giving different numbers but this time it complained that "that is a bad direction". However \boxdir 0TRT gives no error (actually you can replace 0 with any other number) but that would not change the direction of any box.</div>
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