This is a binding to libpq: the C application
programmer's interface to PostgreSQL. libpq is a
set of library functions that allow client
programs to pass queries to the PostgreSQL
backend server and to receive the results of
these queries.
There are technicallly two breaking changes in this release,
but they shouldn’t affect anyone not doing anything weird.
Binary parameters are passed without copying.
FFI functions are imported without unsafe. Most uses were incorrect.
We make all calls “safe”, as checking whether libpq functions do IO
or may call a notifier (potentially calling back into Haskell),
is virtually impossible for all versions of libpq.
(The above properties are not specified in the documentation).
