We tried to maintain backward-compatibility as much as possible, so, current users of basic epgsql features shouldn't notice any difference. If you use some advanced features, please consult "Incompatibilities" section and do some extra testing.
* Make epgsql commands pluggable (see pluggable_commands.md).
Now we are not limited only by API functions provided by epgsql (equery/squery/prepared_query etc),
but may create own commands as a plugins. Still, understanding of PostgreSQL network protocol needed
to be able to do so.
* Make epgsql datatype encoding/decdoding pluggable (see pluggable_types.md).
Now we are able to add or tweak codecs for existing as well as custom PostgreSQL