This type map casts all values received from the database server to Strings and sends all values to the server after conversion to String by
#to_s . That means, it is hard coded to
PG::TextEncoder::String for value encoding and to
PG::TextDecoder::String for text format respectively
PG::BinaryDecoder::Bytea for binary format received from the server.
It is suitable for type casting query bind parameters, result values and COPY IN/OUT data.
This is the default type map for each