[DISCUSSION] Views of immutable objects.

[Paulo Levi]

What about adding a method to String complementing the call toCharArray(),
only it takes 3 arguments:
An char array, a position and a length, that inside uses System.arrayCopy.
This would create the possibility to eliminate news when we just want to
copy Strings, and still preserve immutability.
I'm asking this in string and not using the ChartAt interface for a simple
reason:
Abstraction leakage
The only way to copy a string into a char array is (currently) to transform
it into a char[] and copy it into the original o(2n) or to iterate over all
the chars with o(n* (1 + constantboundCheck)).
CharSequence does not assume that the underlying primitive representation is
a char [] so it does not have a method that takes one. Maybe it should,
maybe it shouldn't, but on the other hand i believe that at least string
should have a method like that.
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