Actor doesn't persist the identifier value

[harshil1712]

Describe the bug
The Actor doesn't persist the this.identifier value. When setting an alarm for >20s and using the this.identifier value in the callback function of the alarm, this.identifier gets set to default.

To Reproduce
Steps to reproduce the behavior:

1. Run the example: https://github.com/harshil1712/do-actors-repro
2. In the logs the message gets displayed

Expected behavior
The value of this.identifier should persist, irrespective of the scheduled time.

Information (please complete the following information):

• Typescript: 5.8.3
• Node.js: 22.14.0
• Wrangler: 4.26.0
• Actor Version: 0.0.1-beta.3

[harshil1712]

On further investigation, the Alarm actually gets triggered for a default DO, rather than the DO it was created for.