The following bug has been logged on the website:
Bug reference: 15836
Logged by: Yuming Wang
Email address: wgyumg(at)gmail(dot)com
PostgreSQL version: 12beta1
Operating system: linux
Description:
Converting 'of' to a boolean type should throw an invalid input syntax.
Because we said in the documentation that 'of' is not accepted as an input
to the boolean data type:
https://www.postgresql.org/docs/12/datatype-boolean.html
```
postgres=# select cast('of' as boolean);
bool
------
f
(1 row)
```