I want to know the answer to the following question:
How many of the symbols are the same in the beginning of the ASCII and Unicode?
All the background I'm provided with is that "Even more importantly, forward compatibility is ensured as software that recognizes only 7-bit ASCII characters as special and does not alter bytes with the highest bit set (as is often done to support 8-bit ASCII extensions such as ISO-8859-1) will preserve UTF-8 data unchanged.". Is that enough to answer the question?
Answer: no