/**
* Constructs a ByteSink that reserves append capacity and will append bytes to the dest string.
*
* @param dest pointer to string object to append to
* @param initialAppendCapacity capacity beyond dest->length() to be reserve()d
/**
* Constructs a ByteSink that reserves append capacity and will append bytes to the dest string.
*
* @param dest pointer to string object to append to
* @param initialAppendCapacity capacity beyond dest->length() to be reserve()d