investigate and fix #940 - boxed args bounds fail

src/NRediSearch/Literals.cs

@@ -45,6 +45,6 @@ public static object Literal(this string value)
         /// Obtain a pre-boxed integer if possible, else box the inbound value
         /// </summary>
         /// <param name="value">The value to get a pre-boxed integer for.</param>
-        public static object Boxed(this int value) => value >= BOXED_MIN && value <= BOXED_MAX ? s_Boxed[value - BOXED_MIN] : value;
+        public static object Boxed(this int value) => value >= BOXED_MIN && value < BOXED_MAX ? s_Boxed[value - BOXED_MIN] : value;
     }
 }

tests/NRediSearch.Test/Isssues/Issue940.cs

+using Xunit;
+
+namespace NRediSearch.Test
+{
+    public class Issue940
+    {
+        [Fact]
+        public void Paging_Boxing()
+        {
+            for(int i = -20; i < 100; i++)
+            {
+                var boxed = i.Boxed();
+                Assert.Equal(i, (int)boxed);
+            }
+        }
+    }
+}