Fails - 1.0 must be backwards incompatible with 0.0

coremodel.cue

package foo

import "github.com/grafana/thema"

thema.#Lineage
name: "foo"
seqs: [
	{
		schemas: [
			{// 0.0
				// Init is a string. This comment goes with the field thru codegen
				init: string
			},
		]
	},
	{
		schemas: [
			{// 1.0
				// Init is a string. This comment goes with the field thru codegen
				init: string
				// newfield is an optional field
				newfield?: int32
			},
		]
	}
]

output

$ make gen-cue
generate code from .cue files
go generate ./pkg/framework/coremodel
could not process coremodel dir /Users/sdboyer/ws/grafana/pkg/coremodel: schema 1.0 must be backwards incompatible with schema 0.0
exit status 1
pkg/framework/coremodel/interface.go:5: running "go": exit status 1
make: *** [gen-cue] Error 1