Generic Methods in Go 1.27

Go 1.27 now allows methods to define their own type parameters independently of their receiving struct, eliminating a limitation that had existed since generics were introduced in Go 1.18. This change enables cleaner API design by allowing method-specific type parameters like `U` in a `Map` method without adding them to the struct itself. However, generic methods are limited to concrete types and cannot be used with interfaces, a restriction necessary because Go's runtime interface system conflicts with compile-time generic resolution.