replace IL-emit in scripting engine with Expression trees; remove dependency and work on UWP

StackExchange.Redis/StackExchange.Redis.csproj

@@ -14,11 +14,10 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' == 'Debug' and '$(Computername)'=='OCHO'">
-    <DefineConstants>$(DefineConstants);LOGOUTPUT</DefineConstants>
+    <!--<DefineConstants>$(DefineConstants);LOGOUTPUT</DefineConstants>-->
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Reflection.Emit.Lightweight" Version="4.3.0" />
     <PackageReference Include="System.IO.Pipelines" Version="$(CoreFxVersion)" />
     <PackageReference Include="System.Diagnostics.PerformanceCounter" Version="$(CoreFxVersion)" />
   </ItemGroup>

StackExchange.Redis/StackExchange/Redis/RedisKey.cs

@@ -157,7 +157,11 @@ public override int GetHashCode()
         /// </summary>
         public override string ToString() => ((string)this) ?? "(null)";
 
-        internal RedisValue AsRedisValue() => (byte[])this;
+        internal RedisValue AsRedisValue()
+        {
+            if (keyPrefix == null && keyValue is string) return (string)keyValue;
+            return (byte[])this;
+        }
 
         internal void AssertNotNull()
         {

StackExchange.Redis/StackExchange/Redis/TaskSource.cs

 using System.Threading.Tasks;
-using System;
-using System.Reflection;
-using System.Reflection.Emit;
 
 namespace StackExchange.Redis
 {