Hello Teodor,
> For completeness it's possible to add direct cast from numeric/boolean types
> to jsonb. Then such casts will be mutual.
+1. I see no reason why we can't have int4 -> jsonb or bool -> jsonb
casts.
> Agree, something like "could not convert jsonb value to boolean type. jsonb
> value must be scalar boolean type"?
I checked what error messages are used currently:
```
# select 123::int4::jsonb;
ERROR: cannot cast type integer to jsonb
LINE 1: select 123::int4::jsonb;
```
I suggest to follow the same template, i.e. "cannot cast type jsonb to
bool", etc.
--
Best regards,
Aleksander Alekseev