Processing version is still in development (the number 0270 is a numbering system I think Ben Fry uses to keep on top of versions). I somewhat expect that when it lands it will be something like 4.0.0 in semantic versioning (denoting major change and possible incompatibility with previous versions, although I expect many libraries to continue to work). For a maven project the version would probably be 4.0.0-SNAPSHOT which would warn you to expect changes until release.
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