qualified:name: foo=1 bar=2
key 22:25 ^-^
sep 25:26 ^
num 26:27 ^
row 26:27 ^
pair 22:27 ^---^
key 16:19 ^-^
sep 19:20 ^
num 20:21 ^
row 20:21 ^
pair 16:21 ^---^