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

[Paulo Levi]

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

With appropriate covariant returns down the inheritance tree.