> A lack of a colon is clearly an oversight.
You mean {"k"}? That's PostgreSQL array syntax, not JSON. It's correct. ('{"k"}' could also be written ARRAY['k'].)
You mean {"k"}? That's PostgreSQL array syntax, not JSON. It's correct. ('{"k"}' could also be written ARRAY['k'].)
EDIT: Okay, so I looked up what {'k'} means, i.e. it's an array with one element 'k'. And in the article's function it's the "path" to the key to be set.
Still not sure if ARRAY['k'] is a thing, though. I could only find this sort of syntax described in the context of definition, e.g. ARRAY[4] for an array of length 4.
Yes it is. It's an alternative way of writing an array. Typically easier for e.g. text values as the quoting follows the normal SQL rules, e.g.
array['foo"bar', 'bla']
'{"foo\"bar", "bar"}'