Upgrading from 1.20 to 1.30 breaks on older browsers (IE10), because it doesn't support Map and Set, even though it's never used in the app. I think the checks `instanceof Set` and `instanceof Map` should be preceded by a `typeof Map !== "undefined"` to ensure it is a platform that supports these.
This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be still under discussion. The issue was opened by marcioapm and has received 1 comments.