🎁 Pull Request

• Used a clear / meaningful title for this pull request
• Tested the changes in your own code (on your projects)
• Added / Edited tests to reflect changes (tests folder)
• Have read the Contributing part of the Readme
• Passed npm test

Fixes

Adds a test case in the Function/Exact tests for excess property checking

Why have you made changes?

It was unclear whether Function/Exact supported excess property checking

What changes have you made?

• added a test case

What tests have you updated?

• added a test case in tests/Function

Is there any breaking changes?

• Yes, I changed the public API & documented it
• Yes, I changed existing tests
• No, I added to the public API & documented it
• No, I added to the existing tests
• I don't know

Anything else worth mentioning?

Ref: #319 (comment)