In 6.5.2 it says:

The .minimum, .optimum, and .maximum components of the half-leading 
trait are set to 1/2 the difference of the computed value of the 
line-height property and the computed value of the sum of the 
text-altitude and text-depth properties. The .precedence 
and .conditionality components are copied from the line-height 

If the line-height is smaller than the total text height we get a 
negative "half-leading" trait value. Is that a legal/sensible/plausible 
value or should it be forced to 0 in this case?

For 2 of the 3 different line-stacking-strategies the half-leading trait 
becomes a space-before/after specifier on the line area and therefore 
becomes part of the space resolution algorithm. I assume negative 
values are OK in that case although I am not sure?


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