Updated to support .NET Standard 2.1

Author: Oren (electricessence)

Open.Numeric.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
     <Authors>electricessence</Authors>
     <Company />
     <Product />
@@ -10,16 +10,17 @@ Includes precision extensions for floating point numbers.
 
 Part of the "Open" set of libraries.</Description>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
-    <PackageLicenseUrl>https://github.com/electricessence/Open.Numeric/blob/master/LISCENSE.md</PackageLicenseUrl>
+    <PackageLicenseUrl></PackageLicenseUrl>
     <Copyright>https://github.com/electricessence/Open.Numeric/blob/master/LISCENSE.md</Copyright>
     <RepositoryUrl>https://github.com/electricessence/Open.Numeric/</RepositoryUrl>
     <PackageProjectUrl>https://github.com/electricessence/Open.Numeric/</PackageProjectUrl>
     <RepositoryType>git</RepositoryType>
     <PackageTags>dotnet, dotnetcore, cs, numbers, double, float, precision, extensions</PackageTags>
-    <Version>1.2.1</Version>
-    <AssemblyVersion>1.2.1.0</AssemblyVersion>
-    <FileVersion>1.2.1.0</FileVersion>
-    <PackageReleaseNotes></PackageReleaseNotes>
+    <Version>2.0.1</Version>
+    <AssemblyVersion>2.0.1.0</AssemblyVersion>
+    <FileVersion>2.0.1.0</FileVersion>
+    <PackageReleaseNotes>Added .NEt Standard 2.1 support.</PackageReleaseNotes>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
@@ -31,15 +32,15 @@ Part of the "Open" set of libraries.</Description>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
+    <PackageReference Include="System.Memory" Version="4.5.3" />
+  </ItemGroup>
+
   <ItemGroup>
     <None Remove=".git" />
     <None Remove=".gitignore" />
     <None Remove="LISCENSE.md" />
     <None Remove="README.md" />
   </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Include="System.Memory" Version="4.5.1" />
-  </ItemGroup>
-
 </Project>

ProcedureResult.cs

@@ -1,5 +1,4 @@
-
-using Open.Numeric.Precision;
+using Open.Numeric.Precision;
 using System;
 using System.Globalization;
 

ProcedureResults.cs

@@ -8,15 +8,15 @@ public class ProcedureResults : IProcedureResult<ReadOnlyMemory<double>>
 		public int Count { get; }
 		public ReadOnlyMemory<double> Sum { get; }
 		public ReadOnlyMemory<double> Average { get; }
-		public ProcedureResults(ReadOnlySpan<double> sum, int count)
+		public ProcedureResults(in ReadOnlySpan<double> sum, int count)
 		{
 			Count = count;
 			var s = sum.ToArray();
 			Sum = s;
 			Average = s.Select(v => count == 0 ? double.NaN : v / count).ToArray();
 		}
 
-		static double[] SumValues(ReadOnlySpan<double> a, ReadOnlySpan<double> b)
+		static double[] SumValues(in ReadOnlySpan<double> a, in ReadOnlySpan<double> b)
 		{
 			if (a.Length != b.Length)
 				throw new ArgumentException("Length mismatch.");
@@ -29,8 +29,8 @@ static double[] SumValues(ReadOnlySpan<double> a, ReadOnlySpan<double> b)
 			return result;
 		}
 
-		public ProcedureResults Add(ReadOnlySpan<double> values, int count = 1)
-			=> new ProcedureResults(SumValues(Sum.Span, values), Count + count);
+		public ProcedureResults Add(in ReadOnlySpan<double> values, int count = 1)
+			=> new ProcedureResults(SumValues(Sum.Span, in values), Count + count);
 
 		public static ProcedureResults operator +(ProcedureResults a, ProcedureResults b)
 			=> new ProcedureResults(SumValues(a.Sum.Span, b.Sum.Span), a.Count + b.Count);