I don't understand how one can claim to "invent" reallocarray. Glib has had g_realloc_n() since 2010, but its not something being touted as a huge invention. Its a tiny helper. Very useful, but quite obvious.
I think the Author is saying that people often use BSD code or ideas and reimplement them to be fundamentally incompatible yet using the same name.
this means that, as a developer, when calling these functions you can't be sure of if you're calling it in a safe way.. openBSD makes code deliberately designed to be portable, and other BSD's make it non-portable by altering it in odd ways, yielding dangerous consequences by reusing the namespace.
