lol ofcourse no one is going to write the same post twice but it's not a human error else this thread and others like it would not exist now would they?!
You need to look at the bigger picture. I'm a developer and I made CSV 2 POST and CSV 2 POST Plus which imports any data to use it to make posts. Like if someone has a directory of Jewish Synagogues on a basic PHP website and want to transfer to WordPress the fastest way to create the pages is import yes?
Well some importers already exist but my own occasionally creates duplicates despite have 3 different checks in place to prevent it.
Once I figure it out however I'm sure I'll prevent my plugin from creating the occasional duplicates.
That will be my education. Your education is this...
"Title already exists the SLUG will be modified by adding a -2 to the URL/Slug" says SteveFree who knows that we need to check both title and post_name a.k.a slug for any existing matches.
He was asking for a way to prevent duplicates because currently if you inject one million rows of data into wordpress using wordpress functions. WordPress still allows duplicates. You can check for existing title and slug to do this and so yes he was talking about duplciate post titles in order to prevent entire duplicate posts!
Unless he is planning on multiple posts with the same content and just different titles! No.