Whilst reviewing PR #3396, I discovered that javalib String appears to be missing two static join methods.

The StringJoiner class in PR #3396 may be useful to implement the missing methods.

Scala Native does not have some String methods, such as, I believe, intern because they are hard to
implement or of low value. It looks like it is time to inventory the String methods to see what is
missing and why. I personally like the style of leaving an unimplemented methods as
// def intern(): Mumble // Unimplented, too hard. Some folks frown on that style. I find
it useful to find such a "broken heart" rather than a stunning & hard to find absence.
Shows that someone at least considered the issue.