Add v3 todos

v3.md

@@ -1,4 +1,6 @@
-# V3 Changes
+# V3 Experimental
+
+## Changes
 
 Rename Oid to OID in accordance with Go naming conventions.
 
@@ -9,3 +11,22 @@ Rename Pid to PID in accordance with Go naming conventions.
 Rename Uuid to UUID in accordance with Go naming conventions.
 
 Logger interface reduced to single Log method.
+
+## TODO / Possible / Investigate
+
+Organize errors better
+
+Optionally use Go 1.7 context
+
+Remove circular dependency between Conn and ConnPool such that ConnPool depends on Conn, but Conn doesn't know anything about ConnPool
+
+Extract types Null* and Hstore to separate package
+
+Remove names from prepared statements - use database/sql style objects
+
+Better way of handling text/binary protocol choice than pgx.DefaultTypeFormats or manually editing a PreparedStatement. Possibly an optional part of preparing a statement is specifying the format and/or a decoder. Or maybe it is part of a QueryEx call... Could be very interesting to make encoding and decoding possible without being a method of the type. This could drastically clean up those huge type switches.
+
+Copy protocol support (this potentially ties in with text/binary protocol)
+ValueReader / msgReader cleanup
+
+Make easier / possible to mock Conn or ConnPool (https://github.com/jackc/pgx/pull/162)