Type designers, which of these statements most closely matches your practice of spacing ligatures (fi, for example)?
1) I give the same or about the same space between ligated letters as I would between their unligated forms: evenness of color demands that consistency. Thus, for example, the fi ligature is even in width with the unligated letters fi.
2) Ligatures "tie" letters together: I always and rather consistently tighten the internal space of ligatures relative to the space between their unligated forms. The fi ligature is predictably narrower than the unligated letters fi.
3) The space between ligated letters is an internal counter with its own design demands: there is no special relation between it and the space between those letters' unligated forms. The fi ligature bears no consistent relation in width to the unligated letters fi.