问在网络源代码中，委托Action/Func的最大参数是8，在元数据中是16，为什么？

EN

Action<float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float> MAction;
Func  <float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float> MFunc;

 #region Assembly System.Core, Version=4.0.0.0, Culture=neutral,  PublicKeyToken=b77a5c561934e089
 // C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5.2\System.Core.dll
 #endregion
 namespace System
 {
      public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, in T15, in T16, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15, T16 arg16);
 }

 public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8);