The following code

creates a string literal (inside of a buffer output) with a value of # since we un-escape any escaping needed in the source code and store the “actual” value. (The pretty printer will re-apply escapes as-needed)

However the following code

should create a string literal (inside a buffer output) with a value of ## since we don’t need to un-escape this value as it was not escaped in the first place! It's Just a literal ##.