Return an array of the underlying storage from {@code buf} into a byte array.
The copy will start at {@code start} and copy {@code length} bytes.
If {@code copy} is true a copy will be made of the memory.
If {@code copy} is false the underlying storage will be shared, if possible.
Return an array of the underlying storage from {@code buf} into a byte array. The copy will start at {@code start} and copy {@code length} bytes. If {@code copy} is true a copy will be made of the memory. If {@code copy} is false the underlying storage will be shared, if possible.