this
Devtome article on luajit appears to be plagiarized from
this blog post. unless they are the same author of course. what can be done to prevent some things or verify they are the same author?
Writers work is checked for plagiarism and writers have to prove they own original work (usually by a link on the original saying also published on Devtome or something similar)
If you click on "Old revisions" on the article on Devtome, you will see who the author is. (and who has added to or edited it)
If you do a search for the author on Devtome, you will find a link to his user profile (in this case develcuy (wiki:user))
If you follow the link, it will show the article you mentioned, with a link to the original source. (in this case Develcuys blog)