--- a/Implab/Safe.cs	Thu Feb 01 02:43:35 2018 +0300
+++ b/Implab/Safe.cs	Sun Feb 11 00:49:51 2018 +0300
@@ -6,6 +6,7 @@
 using System.Diagnostics;
 using System.Collections;
 using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
 
 #if NET_4_5
 using System.Threading.Tasks;
@@ -48,14 +49,14 @@
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void ArgumentGreaterThan(int value, int min, string paramName) {
+        internal static void ArgumentGreaterEqThan(int value, int min, string paramName) {
             if (value < min)
                 throw new ArgumentOutOfRangeException(paramName);
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void ArgumentInRange(int value, int min, int max, string paramName) {
-            if (value < min || value > max)
+        public static void ArgumentInRange(bool condition, string paramName) {
+            if (!condition)
                 throw new ArgumentOutOfRangeException(paramName);
         }
 
@@ -144,6 +145,12 @@
         public static void NoWait(IPromise promise) {
         }
 
+        public static void NoWait(Task promise) {
+        }
+
+        public static void NoWait<T>(Task<T> promise) {
+        }
+
         [DebuggerStepThrough]
         public static IPromise<T> Run<T>(Func<IPromise<T>> action) {
             ArgumentNotNull(action, "action");