The only problem I have with PostgreSQL's JSONB type is it strictly implements the JSON standard, so things like nulls and integers aren't supported. Depending on your data, this could be a real problem.
FWIW, JSONB supports JSON nulls, and all numbers are encoded as `numeric` type, storing integers and float64 values precisely (well, as much as possible for float64 values).
But you comment is correct for other data types like date-times and binary strings where some form of encoding/decoding is needed.
