PPN: Element-wise brace expansion notation

[trevorld]

• By default multiple brace expansions are expanded as a cross-product i.e. {a..b}{1..2} is same as a1 a2 b1 b2
• Sometimes would be nice to have a brace expansion expanded element-wise i.e. get a1 b2
• If one side is shorter than the other would be nice to recycle elements as needed
• In mathematics notation the element-wise product is notated by a circle with a dot in the middle ⊙ (U+2299) which looks like the bilabial click ʘ (U+0298).
• As an ASCII alternative perhaps use {} or (.) or perhaps ! i.e. {a..b}{}{1..2} or {a..b}(.){1..2} or {a..b}!{1..2}?