.NET 9 has so much good stuff in it. Thing that I randomly realized I wanted only to find out it works in 9 is dictionary access with "related" types (so like i

.NET 9 has so much good stuff in it. Thing that I randomly realized I wanted only to find out it works in 9 is dictionary access with "related" types (so like if you have a ReadOnlySpan<char> you can use that to find a value from a string in the dictionary via a value type created off the dict).