From 6f5d3838346752dc9bf28bd85bd11648b99aa84b Mon Sep 17 00:00:00 2001
From: Gav Wood <gav@ethcore.io>
Date: Thu, 14 Jan 2016 22:45:50 +0100
Subject: [PATCH] Storage should kill zero entries.

---
 src/account.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/account.rs b/src/account.rs
index 0923692d1..44a07738b 100644
--- a/src/account.rs
+++ b/src/account.rs
@@ -187,7 +187,10 @@ impl Account {
 			if f == &Filth::Dirty {
 				// cast key and value to trait type,
 				// so we can call overloaded `to_bytes` method
-				t.insert(k, &encode(&U256::from(v.as_slice())));
+				match v.is_zero() {
+					true => t.remove(k),
+					false => t.insert(k, &encode(&U256::from(v.as_slice()))),
+				}
 				*f = Filth::Clean;
 			}
 		}