In D&D 3.0, the
darkness spell was a sphere of blackness, impenetrable even to darkvision, which was terrifyingly powerful (except against demons and devils).
In D&D 3.5, it's a zone of 20% concealment, even to creatures with darkvision, which is annoying and frustrating for PCs of races with darkvision.
In Pathfinder and Trailblazer, it's a reduction in light level… which usually generates concealment but doesn't apply to creatures with darkvision, which makes it pretty weak given how common darkvision and low-light vision are.
How did the spell operate in earlier editions of D&D? Did it affect creatures with dark- (er, infra-) vision? If it did, is it known why it was designed in this way?