On Friday, February 14, 2020, Bryn Llewellyn <bryn(at)yugabyte(dot)com> wrote:
>
> The doc (“Builds a JSON object out of a text array.”) is simply too terse
> to inform an answer to this question.
>
It does presume knowledge but it precisely defines the outcome:
PostgreSQL arrays are typed and all members are of the same type. A text
array’s members are all text.
Given the above knowledge the fact that the resultant json object contains
exclusively text keys and text values directly follows.
David J.