ocaml-batteries-team/batteries-included — pull request #212 by sliquister (2012-01-08 03:05:08+00:00)
Title: Implementation of finger trees (as said in #192)

It may require a few changes to make it more homogeneous with the rest of the lib.
I don't know what the coding conventions are, I can't find them, I can't infer them from the existing modules so I simply left all the naming and exception throwing as I wrote it initially (which should somewhat resemble BatDeque).