I'm using snapcraft trunk. Since https://github.com/snapcore/snapcraft/pull/2334 landed, my old snapcraft files cause this error: Issues while validating snapcraft.yaml: The 'version' property does not match the required schema: 2.11 is not a valid snap version string. Snap versions consist of upper- and lower-case alphanumeric characters, as well as periods, colons, plus signs, tildes, and hyphens. They cannot begin with a period, colon, plus sign, tilde, or hyphen. They cannot end with a period, colon, or hyphen. The message appears contradictory, as "2.11" does fulfil the requirements mentioned. It was non-obvious to figure out that version: 2.11 is incorrect, but version: "2.11" is considered correct. If I stumble on this, many others will, as lot of existing docs refer to the non-quoted style: https://github.com/ubuntu-core/snapcraft-examples/blob/master/05-hello-world-combined/snapcraft.yaml https://docs.snapcraft.io/snapcraft-yaml-reference/4276 Can the old non-quoted style be made acceptable again? Just to keep backward compatibility? At the very least, can you make the error message more suitable?