What is the internal representation of data in PostgreSQL?

Question

PostgreSQL

To work with libpq, you need to know the internal representation of data in PostgreSQL, but I cannot find this information in the official documentation, and indeed on the Internet. Yes, of course, you can use a text representation, not a binary one, but this is an overhead for converting to / from strings, and you really don’t want to parse human-readable strings. References to sources like "src/backend/utils/adt/numeric.c::numeric_recv()" did not bring any benefit.
What is this notorious "server storage format"?

Answer 1

Numeric values ​​of type integer come in network byte order , numeric depends on the implementation you refer to in the question.
Text and so can be obtained by text.