It's been part of F# since 2007 and C# since 2013, so the feature was probably known at design time of the language. However, language design is always a compli

It's been part of F# since 2007 and C# since 2013, so the feature was probably known at design time of the language. However, language design is always a complicated dance of trade-offs, so there's never a way to initially account for all features that are eventually desired and implemented.