Currently, the jitsi_server_url field of the realm state that the Zulip API sends to clients as part of the /register API response doesn't consistently end with or without a trailing slash. As a result, clients are creating Jitsi meeting URLs with an additional slash. If the API removed the trailing slash from the value read from Django settings before adding it to the realm state, this issue

Currently, eggs are exported in json format. Eggs can contain a lot of multiline strings, which makes it very hard to read them in json format.

YAML has much better support for multiline strings (see here) which would make it much easier to modify eggs as code and see changes in Pull Requests.
In addition YAML is easier to read and we've converted wings to use ya