From c66477c69097b15b90d9474222e308baeaa929a6 Mon Sep 17 00:00:00 2001
From: Remco Bloemen <remco@wicked.ventures>
Date: Wed, 13 Jun 2018 18:37:12 +0200
Subject: Clean low bits in bytes4

---
 packages/contracts/src/contracts/current/utils/LibBytes/LibBytes.sol | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/contracts/src/contracts/current/utils/LibBytes/LibBytes.sol b/packages/contracts/src/contracts/current/utils/LibBytes/LibBytes.sol
index c443dda8f..4a1397470 100644
--- a/packages/contracts/src/contracts/current/utils/LibBytes/LibBytes.sol
+++ b/packages/contracts/src/contracts/current/utils/LibBytes/LibBytes.sol
@@ -451,6 +451,9 @@ library LibBytes {
         );
         assembly {
             result := mload(add(b, 32))
+            // Solidity does not require us to clean the trailing bytes.
+            // We do it anyway
+            result := and(result, 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
         }
         return result;
     }
-- 
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