Invalid Cursor error returned for a specific Cursor values

[Vladislav Fitc]

Describe the bug 🐛

While browsing object using Index.browse(cursor: Cursor?, requestOptions: RequestOptions?) may return Invalid Cursor error for a specific cursor value.

To Reproduce 🔍
Steps to reproduce the behavior:

1. Launch Index.browse with the cursor value containing plus sign (e.g. AgA+Bgg4MTUyNTQ0Mg==)
2. Request fails returning 400: invalid cursor error

Expected behavior 💭

Iterative calls of Index.browse(cursor: Cursor?, requestOptions: RequestOptions?) method don't fail until the browse of an index completed.