Why does CharSequence not have String getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)

[Paulo Levi]

Well maybe there SHOULD be a way that the method didn't exist in the
earlier version. A way that failed at compile time when the user of
the api tried to use that CharSequence. What is wrong about having a
field in the class definition (version) and the platform having a
series of of Interface alterations declared (since version). Then it
could raise a error on the client, if he tried to use the method on a
compiled api (or even better not show the method).

Is this impossible?