Uint256 benchamrk

[dangershony]

Uint256_CreateNew

BenchmarkDotNet=v0.12.0, OS=Windows 10.0.18362
Intel Core i9-9980HK CPU 2.40GHz, 1 CPU, 16 logical and 8 physical cores
.NET Core SDK=3.1.201
  [Host]     : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT
  DefaultJob : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT

Method	Mean	Error	StdDev	Rank	Gen 0	Gen 1	Gen 2	Allocated
Uint256_New	7.028 ns	0.2078 ns	0.2474 ns	1	0.0057	-	-	48 B
Uint256_Old	20.234 ns	0.1433 ns	0.1197 ns	3	0.0057	-	-	48 B
Uint256_New_le	16.383 ns	0.3769 ns	0.3342 ns	2	0.0057	-	-	48 B
Uint256_Old_le	96.880 ns	1.9908 ns	3.3805 ns	4	0.0181	-	-	152 B

Uint256_Serialize

BenchmarkDotNet=v0.12.0, OS=Windows 10.0.18362
Intel Core i9-9980HK CPU 2.40GHz, 1 CPU, 16 logical and 8 physical cores
.NET Core SDK=3.1.201
  [Host]     : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT
  DefaultJob : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT

Method	Mean	Error	StdDev	Median	Rank	Gen 0	Gen 1	Gen 2	Allocated
Uint256_Serialize_New	158.9 ns	3.23 ns	4.42 ns	156.4 ns	1	0.0391	-	-	328 B
Uint256_Serialize_Old	186.6 ns	6.67 ns	6.24 ns	185.3 ns	4	0.0391	-	-	328 B
Uint256_Deserialize_New	166.0 ns	3.33 ns	5.18 ns	163.9 ns	2	0.0448	-	-	376 B
Uint256_Deserialize_Old	181.0 ns	1.81 ns	1.69 ns	181.3 ns	3	0.0448	-	-	376 B

Uint256_ToBytes

BenchmarkDotNet=v0.12.0, OS=Windows 10.0.18362
Intel Core i9-9980HK CPU 2.40GHz, 1 CPU, 16 logical and 8 physical cores
.NET Core SDK=3.1.201
  [Host]     : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT
  DefaultJob : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT

Method	Mean	Error	StdDev	Rank	Gen 0	Gen 1	Gen 2	Allocated
Uint256_New	5.848 ns	0.1333 ns	0.1247 ns	1	0.0067	-	-	56 B
Uint256_Old	78.975 ns	1.1740 ns	0.9803 ns	3	0.0372	-	-	312 B
Uint256_New_le	16.448 ns	0.1644 ns	0.1458 ns	2	0.0067	-	-	56 B
Uint256_Old_le	89.557 ns	2.1347 ns	1.9968 ns	4	0.0372	-	-	312 B