Options for the universal parsers, parseAddress and parseCidr. The version-specific parsers take none: they return their own version and nothing else.
readonly
optional
unmapToV4: boolean
Whether an IPv4-mapped IPv6 address (::ffff:a.b.c.d) is returned as
the IPv4 value it carries. Defaults to true (ADR 0004): dual-stack
listeners report IPv4 clients in the mapped form, and almost every
caller wants the IPv4 view. Set to false to keep the bigint.