1. seems like the wrong section; operators are neither primitives or constants.
2. my authorial idea of what i'd like the foci of this document to be are a) figuring out what tools R provides you, b) identifying the surprising ways they behave, c) teaching good idioms for working around them, and d) wrath. i think this falls a little bit too far into "teaching bad behavior by example." is there a way this is useful or alarming in day-to-day use of the language?