From c987f369f991e835e4c362e69366d1dd881d5efc Mon Sep 17 00:00:00 2001
From: Micke <155267459+reallesee@users.noreply.github.com>
Date: Tue, 15 Jul 2025 13:42:04 +0200
Subject: [PATCH] fix(ics-020): improve string prefix check efficiency

---
 spec/app/ics-020-fungible-token-transfer/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/spec/app/ics-020-fungible-token-transfer/README.md b/spec/app/ics-020-fungible-token-transfer/README.md
index 963896d17..668351e56 100644
--- a/spec/app/ics-020-fungible-token-transfer/README.md
+++ b/spec/app/ics-020-fungible-token-transfer/README.md
@@ -255,7 +255,7 @@ function sendFungibleTokens(
 ): uint64 {
     prefix = "{sourcePort}/{sourceChannel}/"
     // we are the source if the denomination is not prefixed
-    source = denomination.slice(0, len(prefix)) !== prefix
+    source = !denomination.startsWith(prefix)
     if source {
       // determine escrow account
       escrowAccount = channelEscrowAddresses[sourceChannel]