Response.clearCookie returns Error: TypeError: option expires is invalid

[BinaryVixen899]

Version

1.0.0-alpha.9

What happened
https://fiddle.fastly.dev/fiddle/c053c616
Doing res.clearCookie in Expressly results in Error: TypeError: option expires is invalid instead of the cookie being cleared.

A workaround is to change this line to
this.cookie(key, "", { ...options, expires: new Date("Thu, 01 Jan 1970 00:00:00 GMT" )});