Return the log level switches dictionary as is, without any allocation

Author: 0xced

src/Serilog.Settings.Configuration/Settings/Configuration/LoadedConfiguration.cs

@@ -7,16 +7,14 @@ namespace Serilog.Settings.Configuration;
 /// </summary>
 public class LoadedConfiguration
 {
-    readonly IDictionary<string, LoggingLevelSwitch> _logLevelSwitches;
-
-    internal LoadedConfiguration(IDictionary<string, LoggingLevelSwitch> logLevelSwitches)
+    internal LoadedConfiguration(IReadOnlyDictionary<string, LoggingLevelSwitch> logLevelSwitches)
     {
-        _logLevelSwitches = logLevelSwitches;
+        LogLevelSwitches = logLevelSwitches;
     }
 
     /// <summary>
     /// The log level switches that were loaded from the <c>LevelSwitches</c> section of the configuration.
     /// </summary>
-    /// <remarks>The keys of the dictionary are the name of the switches without the leading <c>$</c> character.</remarks>
-    public IReadOnlyDictionary<string, LoggingLevelSwitch> LogLevelSwitches => _logLevelSwitches.ToDictionary(e => e.Key.TrimStart('$'), e => e.Value);
+    /// <remarks>The keys of the dictionary are the name of the switches, including the leading <c>$</c> character.</remarks>
+    public IReadOnlyDictionary<string, LoggingLevelSwitch> LogLevelSwitches { get; }
 }

src/Serilog.Settings.Configuration/Settings/Configuration/ResolutionContext.cs

@@ -9,8 +9,8 @@ namespace Serilog.Settings.Configuration;
 /// </summary>
 sealed class ResolutionContext
 {
-    readonly IDictionary<string, LoggingLevelSwitch> _declaredLevelSwitches;
-    readonly IDictionary<string, LoggingFilterSwitchProxy> _declaredFilterSwitches;
+    readonly Dictionary<string, LoggingLevelSwitch> _declaredLevelSwitches;
+    readonly Dictionary<string, LoggingFilterSwitchProxy> _declaredFilterSwitches;
     readonly IConfiguration _appConfiguration;
 
     public ResolutionContext(IConfiguration appConfiguration = null)
@@ -20,7 +20,7 @@ public ResolutionContext(IConfiguration appConfiguration = null)
         _appConfiguration = appConfiguration;
     }
 
-    public IDictionary<string, LoggingLevelSwitch> LogLevelSwitches => _declaredLevelSwitches;
+    public IReadOnlyDictionary<string, LoggingLevelSwitch> LogLevelSwitches => _declaredLevelSwitches;
 
     /// <summary>
     /// Looks up a switch in the declared LoggingLevelSwitches