While building haskeline-0.6.1.5:

Setup.hs:16:7:    Could not find module `Control.Exception.Extensible':          it was found in multiple packages:                Takusen-0.8.4 extensible-exceptions-0.1.1.0

Hmm...

Oops. Sorry. My mistake (shouldn't have exposed our own copy of Control.Exception.Extensible). Easy to fix - just move it from Exposed-modules to Other-modules in the cabal file. I've uploaded 0.8.5 to hackage, with this fixed, and support for PostgreSQL boolean values. Alistair