It conforms to OLD DOS behavior, not even new cmd.exe behavior. It will not match files properly like any other current command. Examples:
wildcard_file("*", "john.txt")
returns false. dir *, copy *, del *, rm *, ls *, cp *, xcopy * all work with john.txt. After IRC discussions, we learned the . was added in old DOS days and that this method is very DOS centric, thus should be removed as all the other DOS stuff has been removed.
dir("*") fails to work as most people expect because of this problem, thus dir() should be updated to use wildcard_match() instead of wildcard_file()
Fixed, all instances of wildcard_file have been updated to use wildcard:is_match instead.
GitHub