What's reasonable is: "Set reserved fields to 0 when writing and ignore them when reading." (I heard that was the original example). Or "Ignore unknown JSON keys" as a modern equivalent.
What's harmful is: Accept an ill defined superset of the valid syntax and interpret it in undocumented ways.
For local /network/ development, maybe, but you’d probably be doing awkward hairpin natting at your router.
So confusing. I'm pretty sure it should be "inheritable", because "inherited" on an attribute means the attribute is inherited, not the element's children will inherit the attribute.
UPDATE: or "inherit", sounds like a command, little less confusing.
I'm not saying it's great for them to drive, I just doubt there's a way to fix it in these sort of places. My grandma cycles to the small store for most of her groceries everyday, it's only the big store she drives to bi-weekly. Honestly the cycling is probably more dangerous, and there's some elderly in my town who're pushing 100 cycling daily.