From 2bda81e60c144f3d55e2d2b1f1872921c4b0998a Mon Sep 17 00:00:00 2001
From: shrsv <athreyac4@gmail.com>
Date: Mon, 19 Oct 2026 10:36:53 +0000
Subject: [PATCH] feat: add Store.Exists lookup helper

LiveReview Pre-Commit Check: skipped (iter:1, coverage:0%)
---
 internal/store_lookup.go | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 internal/store_lookup.go

diff --git a/internal/store_lookup.go b/internal/store_lookup.go
new file mode 100644
index 0000000..18c8e13
--- /dev/null
+++ b/internal/store_lookup.go
@@ -0,0 +1,10 @@
+package internal
+
+// Exists reports whether key is present in the store, without allocating a
+// value copy -- useful for existence checks ahead of a Set/Delete.
+func (s *Store) Exists(key string) bool {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	_, ok := s.data[key]
+	return ok
+}