Tests failing on elixir 1.11 and 1.12 ?

[asmodehn]

While attempting to get rid of warnings in when building inch_ex
I noticed tests failing (with elixir 1.11 and 1.12) :

  1) test json read (InchExTest)
     test/inch_ex_test.exs:10
     ** (FunctionClauseError) no function clause matching in InchEx.CodeObject.children/2

2) test eval() works as expected /1 (InchEx.CodeObjectTest)
     test/inch_ex/code_object_test.exs:4
     ** (ArgumentError) argument error
     code: result = [input] |> InchEx.CodeObject.eval() |> List.first()

  3) test eval() works as expected /2 (InchEx.CodeObjectTest)
     test/inch_ex/code_object_test.exs:40
     ** (FunctionClauseError) no function clause matching in InchEx.CodeObject.children/2

I wondered if someone knew why / had any hints on how to fix them ?
I had a quick look, but I cant figure it out what the code should be doing just yet...