Why does the code editor not preserve the HTML characters?

For example it seems that the plain single-quote character ' (') is converted to the right ones ’ (’) in the HTML page output. I understand the reason for this in the visual editor, but why does it still need to be done in the code editor?

My goal is to preserve the characters so that I can make inputs for Cypher. A piece of JS is in the post to handle this input.

_{FYI: A piece of JS code is needed to use multiple times with different values and function names. How to do it efficiently?}