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/SelfCheck.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace Swan
+{
+    /// <summary>
+    /// Provides methods to perform self-checks in library or application code.
+    /// </summary>
+    public static class SelfCheck
+    {
+        /// <summary>
+        /// <para>Creates and returns an exception telling that an internal self-check has failed.</para>
+        /// <para>The returned exception will be of type <see cref="InternalErrorException"/>; its
+        /// <see cref="Exception.Message">Message</see> property will contain the specified
+        /// <paramref name="message"/>, preceded by an indication of the assembly, source file,
+        /// and line number of the failed check.</para>
+        /// </summary>
+        /// <param name="message">The exception message.</param>
+        /// <param name="filePath">The path of the source file where this method is called.
+        /// This parameter is automatically added by the compiler amd should never be provided explicitly.</param>
+        /// <param name="lineNumber">The line number in source where this method is called.
+        /// This parameter is automatically added by the compiler amd should never be provided explicitly.</param>
+        /// <returns>
+        /// A newly-created instance of <see cref="InternalErrorException"/>.
+        /// </returns>
+        public static InternalErrorException Failure(string message, [CallerFilePath] string filePath = "", [CallerLineNumber] int lineNumber = 0)
+            => new InternalErrorException(BuildMessage(message, filePath, lineNumber));
+
+        private static string BuildMessage(string message, string filePath, int lineNumber)
+        {
+            var frames = new StackTrace().GetFrames();
+            if (frames == null)
+                return message;
+
+            try
+            {
+                filePath = Path.GetFileName(filePath);
+            }
+            catch (ArgumentException)
+            {
+            }
+
+            var frame = frames.FirstOrDefault(f => f.GetMethod().ReflectedType != typeof(SelfCheck));
+            var sb = new StringBuilder()
+                .Append('[')
+                .Append(frame?.GetType().Assembly.GetName().Name ?? "<unknown>");
+
+            if (!string.IsNullOrEmpty(filePath))
+            {
+                sb.Append(": ").Append(filePath);
+                if (lineNumber > 0)
+                    sb.Append('(').Append(lineNumber).Append(')');
+            }
+
+            return sb.Append("] ").Append(message).ToString();
+        }
+    }
+}