Yet another problem with the font I'm working on (or at least I'm trying to work).
If the text is all in Roman, the line spacing is regular, that is homogeneous. If there is a italic word, the space between this line and the line above is larger. Which parameters can it depend on?
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for some glyphs... Can be this the problem'
In any case, which of these values must be equal? all or just some?
Even if after the changes still receive
but it would be a glyphs problem, not a metric one (if I'm not wrong)
Another reason (besides rasterization and hinting) to get your extrema points right.