The signatures of functions in these PRs should be more standard:
#27342,
#25510,
#20936,
including the following:
ipv4numtostring,
ipv4stringtonum,
ipv4stringtonumordefault,
ipv4stringtonumornull,
ipv6numtostring.
This PR will add necessary underscores between the words of each of them,
like changing ipv4numtostring to ipv4_num_to_string.