The Slices package in Go includes a function called Clone, which makes a copy of a slice of any type. The function works by appending to a slice with zero capacity, which allocates a new backing array. The function signature is longer than the body because it needs to be able to handle named slice types. If a named slice type is used as an argument, it will cause an error because the returned value will not have the necessary methods. To fix this, a constraint with a tilde (~) is added to the signature to ensure that the type argument is a slice with the same underlying type. This allows for more flexibility and type inference when using the Clone function. This deconstruction technique can also be applied to other generic functions in Go.
https://go.dev/blog/deconstructing-type-parameters