enable strict concurrency and fix warnings

Package.swift

@@ -12,7 +12,10 @@ let package = Package(
     ],
     targets: [
         .target(
-            name: "GraphQLPagination"
+            name: "GraphQLPagination",
+            swiftSettings: [
+                .enableExperimentalFeature("StrictConcurrency"),
+            ]
         ),
         .testTarget(
             name: "GraphQLPaginationTests",

Sources/GraphQLPagination/Cursor.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-public struct Cursor: RawRepresentable, Hashable {
+public struct Cursor: RawRepresentable, Hashable, Sendable {
     public var rawValue: String
     public init(rawValue: String) {
         self.rawValue = rawValue

Sources/GraphQLPagination/EdgeBuilder.swift

@@ -1,7 +1,7 @@
 import Foundation
 
 /// Describes how to create the cursor for a set of edges.
-public enum CursorType {
+public enum CursorType: Hashable, Sendable {
     /// The edge cursor is based on the node's `cursor` property.
     case identifier
     /// The edge cursor is based on the index of the node.
@@ -37,6 +37,7 @@ public struct EdgesConstruction<Edge> {
 }
 
 extension EdgesConstruction: Equatable where Edge: Equatable {}
+extension EdgesConstruction: Sendable where Edge: Sendable {}
 
 /// A type that can transform a set of nodes into edges with pagination logic.
 public struct EdgeBuilder<Node: GraphCursorable, Edge> {
@@ -96,6 +97,7 @@ struct Bounded<T> {
 }
 
 extension Bounded: Equatable where T: Equatable {}
+extension Bounded: Sendable where T: Sendable {}
 
 fileprivate extension Bounded {
     init(range: Range<Int>, count: Int, nodes: [T], cursors: [Cursor]) {

Sources/GraphQLPagination/Offset.swift

@@ -2,7 +2,7 @@ import Foundation
 
 /// Traditional offset pagination, describing the offset of
 /// the first record, and the number of records to return.
-public struct OffsetPagination: Equatable {
+public struct OffsetPagination: Equatable, Sendable {
     public var offset: Int
     public var count: Int?
     public init(offset: Int = 0, count: Int? = nil) {

Sources/GraphQLPagination/Pagination.swift

@@ -1,7 +1,7 @@
 import Foundation
 
 /// Pagination.
-public enum GraphPagination {
+public enum GraphPagination: Equatable, Sendable {
     case forward(GraphForwardPagination)
     case backward(GraphBackwardPagination)
 }
@@ -50,7 +50,7 @@ extension GraphPaginatable {
 }
 
 /// A concrete forward pagination input.
-public struct GraphForwardPagination: GraphForwardPaginatable {
+public struct GraphForwardPagination: Equatable, Sendable, GraphForwardPaginatable {
     public var first: Int?
     public var after: Cursor?
     public init(first: Int? = nil, after: Cursor? = nil) {
@@ -60,7 +60,7 @@ public struct GraphForwardPagination: GraphForwardPaginatable {
 }
 
 /// A concrete backward pagination input.
-public struct GraphBackwardPagination: GraphBackwardPaginatable {
+public struct GraphBackwardPagination: Equatable, Sendable, GraphBackwardPaginatable {
     public var last: Int?
     public var before: Cursor?
     public init(last: Int? = nil, before: Cursor? = nil) {
@@ -70,7 +70,7 @@ public struct GraphBackwardPagination: GraphBackwardPaginatable {
 }
 
 /// Describes the state of pagination for output.
-public struct GraphPageInfo: Equatable, Codable {
+public struct GraphPageInfo: Equatable, Codable, Sendable {
     public let hasPreviousPage: Bool
     public let hasNextPage: Bool
     public let startCursor: Cursor?