Reads one field out of a posting's free-form meta, returning it only when it is a string and the
caller's fallback otherwise. Kept free of SQL and store specifics so a non-SQL store never
imports engine code for a plain JSON lookup.
Reads typed fields from a posting's free-form meta. Kept free of SQL and store specifics so a
non-SQL store never imports engine code for a plain JSON lookup.
Reads one field out of a posting's free-form meta, returning it only when it is a string and the caller's
fallbackotherwise. Kept free of SQL and store specifics so a non-SQL store never imports engine code for a plain JSON lookup.