I encountered this (to me) unfamilliar behavior in Wordpress.
Consider a random site using WordPress with a page called example with no content. This is just a page type post and not a category, tag or any sort of hierarchy. A 404 error is triggered if I append characters after the last "/":
http://example.com/example/abc
I expect that but if I only type numbers after the final "/" no 404 error is triggered. For example loading:
http://example.com/example/1123456
gets me to example page and the numbers are kept in the URL. The numbers have no special meaning in this case. There could be any nuber there, but I would expect it to trigger a 404 as it does on other sites.
Appending numbers to the URL on index or category pages still seems to trigger a 404, but not on posts and pages.
I am wondering wether this is an actual feature of WordPress and if so, then what is its purpose?