From 893ebb69f61e03640b615b19614682ca33eda124 Mon Sep 17 00:00:00 2001
From: Ulf Wiger <ulf@wiger.net>
Date: Thu, 17 Aug 2023 20:43:59 +0200
Subject: [PATCH] Update src/aeserialization.erl with duplicates check
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From code review

Co-authored-by: Radosław Rowicki <35342116+radrow@users.noreply.github.com>
---
 src/aeserialization.erl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/aeserialization.erl b/src/aeserialization.erl
index 0853e91..11d70a8 100644
--- a/src/aeserialization.erl
+++ b/src/aeserialization.erl
@@ -129,6 +129,7 @@ decode_field(#{items := Items}, List) when length(List) =:= length(Items) ->
     Zipped = lists:zip(Items, List),
     lists:foldl(
       fun({{K, Type}, V}, Map) ->
+              maps:is_key(K, Map) andalso error(badarg, duplicate_field),
               Map#{ K => decode_field(Type, V) }
       end, #{}, Zipped);
 decode_field(Type, List) when length(List) =:= tuple_size(Type) ->