Buffer.this

t {
		
		Buffer buffer = new Buffer(8);
		
		// 8 bytes allocated by the constructor
		assert(buffer.capacity == 8);
		
		// writing 4 bytes does not alter the capacity
		buffer.write(0);
		assert(buffer.capacity == 8);
		
		// writing 8 bytes requires a new allocation (because 4 + 8 is
		// higher than the current capacity of 8).
		// The new capacity is rounded up to the nearest multiple of the chunk size.
		buffer.write(0L);
		assert(buffer.capacity == 16);