fix: do not raise on schema/data with string keys

[iurimateus]

Allow binary keys when traversing data. Unsure if this is the correct fix.

Type of Change

• Bug fix

Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

Example:

iex|29| schema = %{"str" => {:required, :string, {:transform, &String.trim/1}}}
%{"str" => {:required, {:string, {:transform, &String.trim/1}}}}
iex|30| Peri.validate(schema, %{"str" => "aaaaaaa "})
{:ok, %{"str" => "aaaaaaa"}}
iex|31| Peri.validate(schema, %{"a" => "aaaaaaa "})
..!!** (ArgumentError) errors were found at the given arguments:

  * 1st argument: not an atom

    (erts 14.2.2) :erlang.atom_to_binary("str")
    (peri 0.2.6) lib/peri.ex:358: Peri.get_enumerable_value/2
    (peri 0.2.6) lib/peri.ex:302: anonymous fn/3 in Peri.filter_data/2
    (stdlib 5.2) maps.erl:416: :maps.fold_1/4
    (peri 0.2.6) lib/peri.ex:300: Peri.filter_data/2
    (peri 0.2.6) lib/peri.ex:275: Peri.validate/2
    iex:31: (file)
iex|32|Peri.validate(schema, %{"str" => 123})
{:error,
 [
   %Peri.Error{
     path: ["str"],
     key: "str",
     content: %{actual: "123", expected: :string},
     message: "expected type of :string received 123 value",
     errors: nil
   }
 ]}

[zoedsoupe]

thank you so much for the contribution!

[LeartS]

@zoedsoupe could we get a release with this fix? It's quite a critical one!

[zoedsoupe]

sorry, I'm not managing GitHub releases for this library but recently I just released the 0.2.7 package version on hex that includes this fix!

iex(1)> Mix.install [{:peri, "~> 0.2"}]
Resolving Hex dependencies...
Resolution completed in 0.012s
New:
  peri 0.2.7
* Getting peri (Hex package)
==> peri
Compiling 5 files (.ex)
Generated peri app
:ok
iex(2)> schema = %{"str" => {:required, {:string, {:transform, &String.trim/1}}}}
%{"str" => {:required, {:string, {:transform, &String.trim/1}}}}
iex(3)> Peri.validate(schema, %{"a" => "aaaaaaa "})
{:error,
 [
   %Peri.Error{
     path: ["str"],
     key: "str",
     content: %{},
     message: "is required",
     errors: nil
   }
 ]}
iex(9)> Peri.validate(schema, %{"str" => "aaaaaaa "})
{:ok, %{"str" => "aaaaaaa"}}

[LeartS]

Yeah I meant the hex.pm package. Thank you!