Using copy with strings

The Go copy built-in copies things from a source slice to a destination slice.

func copy(dst, src []Type) int

It is not using generics, but Type here serves the same purpose. Or does it?

Not exactly! string is a little-known exception:

As a special case, [copy] also will copy bytes from a string to a slice of bytes.

Next time you need to work with strings while reusing a work buffer, copy might just be the perfect candidate to avoid ugly for rune loops.