feat(csc): full-duplex reader-miss coalescing + invalidation batching

.github/workflows/govulncheck.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v7
         with:
-          go-version: "1.26.x"
+          go-version: "stable"
           cache: true
 
       - name: Install govulncheck

csc_coalesce_options_test.go

@@ -0,0 +1,28 @@
+package redis
+
+import (
+	"testing"
+	"time"
+)
+
+// TestUniversalOptionsSimpleCopiesCSCCoalesce guards that the new CSC miss-
+// coalescing / invalidation-batching knobs reach a standalone Client through
+// UniversalOptions.Simple() (they were previously Options-only, so UniversalClient
+// users could not enable them).
+func TestUniversalOptionsSimpleCopiesCSCCoalesce(t *testing.T) {
+	u := &UniversalOptions{
+		ClientSideCacheRefreshOnInvalidate:     true,
+		ClientSideCacheCoalesceMisses:          true,
+		ClientSideCacheInvalidationBatchWindow: 7 * time.Millisecond,
+	}
+	o := u.Simple()
+	if !o.ClientSideCacheRefreshOnInvalidate {
+		t.Error("Simple() dropped ClientSideCacheRefreshOnInvalidate")
+	}
+	if !o.ClientSideCacheCoalesceMisses {
+		t.Error("Simple() dropped ClientSideCacheCoalesceMisses")
+	}
+	if o.ClientSideCacheInvalidationBatchWindow != 7*time.Millisecond {
+		t.Errorf("Simple() ClientSideCacheInvalidationBatchWindow = %v, want 7ms", o.ClientSideCacheInvalidationBatchWindow)
+	}
+}