Got at least one data fetching method working; turns out, we can't use a patched LogicStack to get the data

Vendor/Swan.Lite-3.1.0/Collections/CollectionCacheRepository.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Swan.Collections
+{
+    /// <summary>
+    /// A thread-safe collection cache repository for types.
+    /// </summary>
+    /// <typeparam name="TValue">The type of member to cache.</typeparam>
+    public class CollectionCacheRepository<TValue>
+    {
+        private readonly Lazy<ConcurrentDictionary<Type, IEnumerable<TValue>>> _data =
+            new Lazy<ConcurrentDictionary<Type, IEnumerable<TValue>>>(() =>
+                new ConcurrentDictionary<Type, IEnumerable<TValue>>(), true);
+
+        /// <summary>
+        /// Determines whether the cache contains the specified key.
+        /// </summary>
+        /// <param name="key">The key.</param>
+        /// <returns><c>true</c> if the cache contains the key, otherwise <c>false</c>.</returns>
+        public bool ContainsKey(Type key) => _data.Value.ContainsKey(key);
+
+        /// <summary>
+        /// Retrieves the properties stored for the specified type.
+        /// If the properties are not available, it calls the factory method to retrieve them
+        /// and returns them as an array of PropertyInfo.
+        /// </summary>
+        /// <param name="key">The key.</param>
+        /// <param name="factory">The factory.</param>
+        /// <returns>
+        /// An array of the properties stored for the specified type.
+        /// </returns>
+        /// <exception cref="ArgumentNullException">
+        /// key
+        /// or
+        /// factory.
+        /// </exception>
+        public IEnumerable<TValue> Retrieve(Type key, Func<Type, IEnumerable<TValue>> factory)
+        {
+            if (key == null)
+                throw new ArgumentNullException(nameof(key));
+
+            if (factory == null)
+                throw new ArgumentNullException(nameof(factory));
+
+            return _data.Value.GetOrAdd(key, k => factory.Invoke(k).Where(item => item != null));
+        }
+    }
+}