Dictionary methods Remove and Clear (.NET Core) modify the collection during enumeration. No exception thrown

Question

I am trying to implement a caching mechanism for enumerating collections safely, and I am checking if all modifications of the built-in collections are triggering an I

Answer 1

To clarify when the change was made available and via which methods...

Microsoft's docs on the Dictionary's .Remove and .Clear have been updated:

.NET Core 3.0+ only: this mutating method may be safely called without invalidating active enumerators on the Dictionary instance. This does not imply thread safety.

.NET Core 3.0 came with C# 8.0. Since then, we have been able to modify a Dictionary during enumeration (foreach) via .Remove and .Clear only.