Considered breaking change because JSON serialization will change, and JSON is used quite often.

Reordering fields without changing their ID is indeed a non-breaking change from what I understand, albeit quite a useless one :)

> a useless one

If you have a (long) list of fields and you want to keep them lexicographically sorted, being able to reorder is quite useful if you rename a field.

	▲	ventana 3 hours ago \| parent [-]
		Renaming is forbidden though (because JSON and textproto). In Google, it's a documented antipattern to try to make protobuf look "nice" by changing field indices, rearranging fields, etc. — the common ground is that it's better to not do it.