refact

Author: ITikhonov

src/StackExchange.Redis/Format.cs

@@ -396,8 +396,9 @@ internal static string GetString(ReadOnlySequence<byte> buffer)
         {
             if (buffer.IsSingleSegment) return GetString(buffer.First.Span);
 
-            var arr = ArrayPool<byte>.Shared.Rent(checked((int)buffer.Length));
-            var span = new Span<byte>(arr, 0, (int)buffer.Length);
+            var length = checked((int)buffer.Length);
+            var arr = ArrayPool<byte>.Shared.Rent(length);
+            var span = new Span<byte>(arr, 0, length);
             buffer.CopyTo(span);
             string s = GetString(span);
             ArrayPool<byte>.Shared.Return(arr);

src/StackExchange.Redis/RedisValue.cs

@@ -961,6 +961,7 @@ private static bool TryParseDouble(ReadOnlySpan<byte> blob, out double value)
                         return ToHex(span);
                     }
                 case StorageType.Sequence:
+                    if (value._length == 0) return "";
                     var seq = value.RawSequence();
                     if (seq.IsEmpty) return "";
                     return Format.GetString(seq);