I believe I am within my rights to quote the excerpt here, Vance to his editor:
Two matters: the first we have discussed before and you have always been most indulgent; but I will bring the matter up again, for you to wave in front of your proof-readers, stating: “Vance is a frightful curmudgeon; he thinks his writing is revelation from heaven. He points out that the rabbis don’t go proof-reading and fiddling with the Dead Sea Scrolls, and that he doesn’t want any similar underlings messing with his stuff, either.
Mention this as well: “Jack Vance adjusts the punctuation in his stuff like a skilled mechanic tuning up a Lamborghini Grand Prix race-car. He examines each colon and semi-colon separately for quality and throws back the rejects.
“The same cautions apply to his spelling, word-usage, and nomenclature unless the occasion is clearly a typo. Hyphens are more ‘off-world’ and ‘off-worlder’.
In regard to spelling I am inconsistent, and in fact see no particular imperative for consistency, in any case. I tend to use the spelling which seems to accord best with the mood of the sentence and attendant circumstances. It is a most complicated business, Glamour, honour, armour all must use the u; color sometimes, and maybe some of the others. But they do not have to be all one way or all the other; this is pedantry.”