Unknown type error in Dialyxir when using cloak_ecto with typed_ecto_schema

[vdegove]

When using cloak_ecto in a typed Ecto Schema (see https://hexdocs.pm/typed_ecto_schema/), Dialyxir (see https://hex.pm/packages/dialyxir) halts with an unknown type error:

$ mix dialyzer

[…]

lib/db/contact.ex:0:unknown_type
Unknown type: Cloak.Ecto.SHA256.t/0.
________________________________________________________________________________
lib/db/contact.ex:0:unknown_type
Unknown type: DB.Encrypted.Binary.t/0.

Ecto Schema:

defmodule DB.Contact do

  typed_schema "contact" do
    field(:email, DB.Encrypted.Binary)
  end
end

defmodule DB.Encrypted.Binary do
  use Cloak.Ecto.Binary, vault: Transport.Vault
end

See https://github.com/etalab/transport-site/blob/master/apps/transport/lib/db/contact.ex, to reproduce the problem remove the line in .dialyzer_ignore.exs.