I doubt anyone will read this after eight years, but I'm having exactly the same problem in Elixir. I pass all the tests except for one in which a point seems to be missing. In fact, I tested the example pasted above and I get exactly the same result.
I'm really sorry because this error will make it impossible to finish this kata.
PS: The script soluction_test.exs is throwing a warning:

warning: missing parentheses for expression following “do:” keyword. Parentheses are required to solve ambiguity inside keywords.

This error happens when you have function calls without parentheses inside keywords. For example:

    function(arg, one: nested_call a, b, c)
    function(arg, one: if expr, do: :this, else: :that)

In the examples above, we don't know if the arguments “b” and “c” apply to the function “function” or “nested_call.” Or if the keywords “do” and “else” apply to the function ‘function’ or “if.” You can solve this by explicitly adding parentheses:

    function(arg, one: if(expr, do: :this, else: :that))
    function(arg, one: nested_call(a, b, c))

Ambiguity found at:
  test/solution_test.exs:88

(New) Rust translation available. Please review and approve!

I've had to reject this translation, sorry.

Rust translate

Merged

python new test frameworks

For those attempting this Kata without outside help, assuming all points are part of the hull and then reducing them is the WRONG approach. It will work, but it's not performant enough (at least for some languages) and you will time out.

Python submission Attempt test cases are all failing; the input and output are switched places.
I copypasted them to my own tests: they pass, the test data itself is ok.

Meanwhile the given Sample tests are working correctly.

Last line of the kata: The array will never be empty.

Also 8th kyu kata are introductory, so error handling would be too advanced for this kata.

Doesn't handle:

• empty list
• bad data where list has elements of None

Thank you for this interesting Kata!

Elixir translation.