jq csv and csv kv and range map

csv.jq

def csv: split(",");
def csv_kv: [csv[] | split("=") | {(.[0]): .[1]}] | add;
def obj_to_csv_kv: [to_entries[] | [.key, .value] | join("=")] | join(",");
# TODO: errors?
def csv_range_map:
	# "0-2=a,1=b" -> ["a", "b", "a"]
	[ csv[]
	  | split("=")
	  | .[1] as $c
	  | .[0]
	  | split(":")[]
	  | split("-")
	  | map(tonumber)
	  | if (.[1] | not) then [.[0], .[0]] end
	  | range(.[0]; .[1]+1)
	  | [., $c]
	  ]
	| reduce .[] as $r ([]; .[$r[0]] = $r[1]);