oh dear

mscorlib/System/Collections/Generic/IReadOnlyCollection.cs

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+using System;
+using System.Runtime.CompilerServices;
+using Cpp2IlInjected;
+
+namespace System.Collections.Generic
+{
+	/// <summary>Represents a strongly-typed, read-only collection of elements.</summary>
+	/// <typeparam name="T">The type of the elements.</typeparam>
+	// Token: 0x02000611 RID: 1553
+	[Token(Token = "0x2000611")]
+	[TypeDependency("System.SZArrayHelper")]
+	public interface IReadOnlyCollection<out T> : IEnumerable<T>, IEnumerable
+	{
+		/// <summary>Gets the number of elements in the collection.</summary>
+		/// <returns>The number of elements in the collection.</returns>
+		// Token: 0x17000757 RID: 1879
+		// (get) Token: 0x06002F0F RID: 12047
+		[Token(Token = "0x17000757")]
+		int Count
+		{
+			[Token(Token = "0x6002F0F")]
+			[Address(Slot = "0")]
+			get;
+		}
+	}
+}