chore: dual-target Base to .NET Standard 2.0

Base/Base.csproj

@@ -1,8 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-      <TargetFramework>net6.0</TargetFramework>
-      <ImplicitUsings>enable</ImplicitUsings>
+      <TargetFrameworks>net6.0;netstandard2.0</TargetFrameworks>
+      <LangVersion>10</LangVersion>
+      <ImplicitUsings>disable</ImplicitUsings>
       <Nullable>enable</Nullable>
       <RootNamespace>FruityFoundation.Base</RootNamespace>
       <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
@@ -15,7 +16,6 @@
       <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
       <PackageLicenseFile>LICENSE</PackageLicenseFile>
   </PropertyGroup>
-
   <ItemGroup>
     <None Include="..\LICENSE" Pack="true" PackagePath="" />
   </ItemGroup>

Base/Extensions/DataReaderExtensions.cs

@@ -1,4 +1,5 @@
-using System.Data;
+using System;
+using System.Data;
 using FruityFoundation.Base.Structures;
 
 namespace FruityFoundation.Base.Extensions;

Base/Extensions/EnumerableExtensions.cs

@@ -1,4 +1,8 @@
-namespace FruityFoundation.Base.Extensions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace FruityFoundation.Base.Extensions;
 
 public static class EnumerableExtensions
 {

Base/Extensions/StringExtensions.cs

@@ -1,4 +1,6 @@
-namespace FruityFoundation.Base.Extensions;
+using System;
+
+namespace FruityFoundation.Base.Extensions;
 
 public static class StringExtensions
 {
@@ -14,5 +16,5 @@ public static class StringExtensions
 	/// <param name="str"></param>
 	/// <param name="maxLength">The maximum number of characters. If <paramref name="str"/> has fewer characters, it will be truncated to the length of <paramref name="str"/>.</param>
 	public static string Truncate(this string str, int maxLength) =>
-		str[..Math.Min(str.Length, maxLength)];
+		str.Substring(0, Math.Min(str.Length, maxLength));
 }

Base/Structures/Maybe.cs

@@ -1,5 +1,8 @@
 // Normally we wouldn't want to disable Nullable references, but in this case we want to.
 // We're assuming that if you're following Maybe conventions, you won't be hitting null ref exceptions.
+
+using System;
+
 #pragma warning disable CS8601
 namespace FruityFoundation.Base.Structures;
 

Base/Structures/MaybeExtensions.cs

@@ -1,4 +1,7 @@
-namespace FruityFoundation.Base.Structures;
+using System;
+using System.Collections.Generic;
+
+namespace FruityFoundation.Base.Structures;
 
 public static class MaybeExtensions
 {

Base/Structures/OneOf.cs

@@ -1,4 +1,6 @@
-namespace FruityFoundation.Base.Structures;
+using System;
+
+namespace FruityFoundation.Base.Structures;
 
 public class OneOf<T1, T2>
 {