I've had no trouble overriding any system files except for this.
I copied /concrete/helpers/form.php into my /helpers/ folder and made changes. When I open my test site, it throws an error (attached). The two files conflict with each other, even though it's supposed to override it like everything else. I fixed it by renaming the file to something else, but I don't want to to get an update months later that replaces it and breaks my site with me having no idea what to do. Is this a bug or something?
Thanks