From f5fdd13de0f02d7b1f9482133a7e4bf8cce14974 Mon Sep 17 00:00:00 2001
From: "Paulo F. Oliveira" <142223309+kivra-pauoli@users.noreply.github.com>
Date: Wed, 24 Jul 2024 08:00:01 +0100
Subject: [PATCH] Fix exposed type (#41)

It's clear, from the implementation, a binary()
is also expected
---
 src/s2_hash.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/s2_hash.erl b/src/s2_hash.erl
index 991b986..dc28b5d 100644
--- a/src/s2_hash.erl
+++ b/src/s2_hash.erl
@@ -43,7 +43,7 @@ luhn(String) when is_list(String) ->
   {_, Sum} = lists:foldr(fun luhn_fold/2, {odd, 0}, IntList),
   (Sum*9) rem 10.
 
--spec luhn_validate(string()) -> boolean().
+-spec luhn_validate(binary() | string()) -> boolean().
 luhn_validate(String) when is_binary(String) ->
   luhn_validate(binary_to_list(String));
 luhn_validate(String) when is_list(String) ->