clearCookie does not include maxAge, neither allows to pass it as options

[aristofun]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Fastify version

5.0

Plugin version

v10.0.1

Node.js version

any

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

any

Description

These are the problematic lines:

fastify-cookie/plugin.js

Lines 42 to 46 in ccb9053

	const opts = Object.assign({ path: '/' }, options, {
	expires: new Date(1),
	signed: undefined,
	maxAge: undefined
	})

Without maxAge: 0 at least some of cookie jar implementations (for example https://www.npmjs.com/package/tough-cookie) keep actual cookie with empty value in the storage instead of deleting them (like they do when maxAge is set to zero).

Because of this flaw some users had to come up with workarounds like this.

Link to code that reproduces the bug

No response

Expected Behavior

maxAge should be set along with expires option

[jsumners]

Would you like to send a Pull Request to address this issue? Remember to add unit tests.

[gurgunday]

Latest RFC says:

Finally, to remove a cookie, the server returns a Set-Cookie header
with an expiration date in the past. The server will be successful
in removing the cookie only if the Path and the Domain attribute in
the Set-Cookie header match the values used when the cookie was
created.

We return new Date(1), which is Thu Jan 01 1970 01:00:00

Our implementation is correct

[aristofun]

Our implementation is correct

Adding maxAge would not make it less correct, would it?

Yet it would improve devX for many users.

[aristofun]

#304