Inherited from Serializable
Inherited by implicit conversion any2stringadd from
Expires to any2stringadd[Expires]
Inherited by implicit conversion StringFormat from
Expires to StringFormat[Expires]
Inherited by implicit conversion Ensuring from
Expires to Ensuring[Expires]
Inherited by implicit conversion ArrowAssoc from
Expires to ArrowAssoc[Expires]
RFC 7231 section 5.3
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expires