Add sendable conformance

.github/workflows/test.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   test-pushpull:
     runs-on: ubuntu-latest
-    container: swift:5.8-focal
+    container: swift:5.9.2-jammy
     steps:
     - uses: actions/checkout@v3
     - name: Run tests

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.8
+// swift-tools-version:5.9
 
 import PackageDescription
 
@@ -32,7 +32,10 @@ let package = Package(
             dependencies: [
                 .product(name: "Collections", package: "swift-collections")
             ],
-            exclude: ["Abstraction/README.md", "Framework/README.md"]
+            exclude: ["Abstraction/README.md", "Framework/README.md"],
+            swiftSettings: [
+                .enableExperimentalFeature("StrictConcurrency=complete")
+            ]
         ),
         .target(
             name: "HTMLKitConverter",
@@ -54,6 +57,9 @@ let package = Package(
             dependencies: [
                 .target(name: "HTMLKit"),
                 .product(name: "Vapor", package: "vapor"),
+            ],
+            swiftSettings: [
+                .enableExperimentalFeature("StrictConcurrency=complete")
             ]
         ),
         .target(

Sources/HTMLKit/Framework/Rendering/Features.swift

@@ -1,5 +1,5 @@
 /// An option set of features.
-public struct Features: OptionSet {
+public struct Features: OptionSet, Sendable {
 
     public var rawValue: Int
 

Sources/HTMLKit/Framework/Rendering/Markdown/Markdown.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-internal final class Markdown {
+internal struct Markdown: Sendable {
 
     /// The markdowns characters
     internal static let characters = CharacterSet(charactersIn: "*_~[`")