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+      Monadic input-output with OCaml.
+    Why?
+  There are many possibilities to implement monadic IO with OCaml.
+It's very annoying to copy and paste types and implementations
+over the projects, but the real reason was the "diamond problem":
+two libraries are using almost same implementation, but different
+    How?
+  There will be type signatures and implementations for monadic
+input-output using Lwt and using direct OCaml input-output
+(since OCaml type system implements "monad with errors", where
+monad that carries 'a is the 'a itself, and errors are propagated
+by exceptions).
+    Details!
+  Module IO_Types contains signatures:
+  - IO_Monad -- just return, bind, bind_rev
+  - IO_MonadError -- IO_Monad + error, catch
+  - IO_Common (functions' signatures that are common to Lwt,
+    Direct IO and possible future IO libraries)
+  There are no need for signatures of IO_Lwt and IO_Direct, so there are
+no its signatures.
+  Module implementations:
+- IO_Pure -- no Lwt, no -threads, no exceptions handling
+- IO_PureError -- IO_Pure + exceptions
+- IO_Lwt -- IO via Lwt
+- IO_Direct -- IO via OCaml's Pervasives + Unix + Sys + Thread modules
+  IO_Lwt and IO_Direct must match all the signatures contained in IO_Types.
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