LDM Notes for February 19th, 2025

[333fred]

https://github.com/dotnet/csharplang/blob/main/meetings/2025/LDM-2025-02-19.md

Agenda

• Extensions

[huoyaoyuan]

Has the interchangeability with F# type extensions be considered? I'm not meaning the lowering of either side should follow the other side, but being able to setup a bridge is nice.

[hez2010]

The compatiblity story would be endless. I do think for such a big feature we can stop aiming for 1:1 compatibility to the old extension methods. The old extension methods are still there and always be there, and they work well and will continue to work well, so I don't see the necessity of allowing to port all the existing methods to the new extensions. Worrying too much about compatibility would only result in a cursed design that disappoints everyone. And DO note we don't need yet another way to write extension methods, the feature needs to be valuable other than providing a "fancy" way to do old things...