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Well, as of today, it uses a binary search and has a much stricter parser.

I would like to share the following in case you encounter the same issue. Class and Record Helpers (Delphi) - RAD Studio states that: Actually, this is not entirely correct. Consider the following: Unit HelperUnit1.pas: TObjectHelper1 = class helper for TObject procedure Test; end; Unit2 HelperUnit2.pas: TObjectHelper2 = class helper for TObject procedure Test; end; Unit SupportClasses,pas: uses HelperUnit1; type TMyClass: class end; Unit MainUnit.pas interface implementation uses SupportClasses, HelperUnit2; begin var MyClass:= TMyClass.Create; MyClass.Test; end; MyClass.Test will use the HelperUnit1.TObjectHelper1.Test implementation even if HelperUnit1 is not even in scope, let alone being "in nearest scope". So it appears that if a class helper is in scope where a class is defined, it is used unconditionally in all units of a project. If not, then what it is stated in the documentation applies.

To be fair, the tests do not seem very realistic to me. And using any non-standard library for a core process like JSON should be not only with Delphi, but also with FPC. We are on the 21st century, and modern object pascal is not just Delphi. ;)

That is correct. Basically, an anonymous method is implemented as an interfaced object with an Invoke() method that matches the signature of the anonymous method. https://stackoverflow.com/questions/39955052/how-are-anonymous-methods-implemented-under-the-hood Not by Embarcadero, as it is an implementation detail of the compiler. But it is a well-known implementation that is documented on numerous sites/blogs.