I have ip4_addr_t and I want to set it to a "null"/invalid value. Is it
better to use IPADDR_NONE or IPADDR_ANY?
At first, I thought IPADDR_NONE was the best choice, but I found that
dns.c uses IPADDR_ANY to flag a DNS server as invalid.
Moreover, there are ip4_addr_isany() and ip4_addr_set_any() macros,
while there aren't ip4_addr_isnone() and ip4_addr_set_none().
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