PostgreSQL and the SQL standards process

you would not eliminate the conversion step, you would just replace the conversion between an text string and the internal data structure with the conversion between the binary sequence and the internal data structure.

different languages (and for that matter, different libraries for a single language) will want to represent the data in different ways.

it would be good to have a standard format that could eliminate the SQL injection type of vulnerability, but it's hard to think of anything that can take an arbitrary byte stream and use it in an arbitrary place in the statement, while still allowing multiple statements in one blob that would eliminate the problem