Summary

Reject non-string cookie values instead of treating falsy non-string values like 0 and false as an empty string.

null and undefined still keep the existing delete-cookie behavior. String values such as '0' continue to serialize normally.

Fixes #101.

Validation

• npx mocha --require test/support/env --reporter spec --bail --check-leaks test/cookie.js
• npx eslint index.js test/cookie.js
• npm test
• npm run lint
• git diff --check