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Why this should be merged
Saves 12 bytes per IP!
How this works
On the receiving side of these IPs, we already handle IPv4 addresses. However for compatibility reasons, we only send IPv6 addresses currently. This is no longer required (as of Etna activation). So we can save the 12 bytes.
How this was tested
The e2e upgrade test verifies that this is backwards compatible.
Need to be documented in RELEASES.md?