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\dim_zero:N \nulldelimiterspace |
The cramped content itself may contain null delimiters, and should not be affected. So, it should be a back kern \kern-\nulldelimiterspace here, rather than zeroing out the dimension register. See latex3/mathtools#18
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\box_use_drop:N \l_tmpa_box |
It should leave vertical mode before typesetting the box. Also, it should add an empty mathord, {}, just before the box, to guard against the rebox mechanism of TeX. See latex3/mathtools#19
unicode-math/um-code-compat.dtx
Line 54 in 184a23b
The cramped content itself may contain null delimiters, and should not be affected. So, it should be a back kern
\kern-\nulldelimiterspacehere, rather than zeroing out the dimension register. See latex3/mathtools#18unicode-math/um-code-compat.dtx
Line 62 in 184a23b
It should leave vertical mode before typesetting the box. Also, it should add an empty mathord,
{}, just before the box, to guard against the rebox mechanism of TeX. See latex3/mathtools#19