// swagger:model Item
type Item struct {
	// Extensions:
	// ---
	// x-nullable: true
	Value *int64 `json:"value"`
}

// swagger:model Item
type Item struct {
	Value *int64 `json:"value"`
}

swagger generate spec --scan-models --nullable-pointers -o ./swagger.yaml && swagger validate ./swagger.yaml

swagger generate spec --scan-models -o ./swagger.yaml && swagger validate ./swagger.yaml

// swagger:model Item
type Item struct {
	// Extensions:
	// ---
	// x-nullable: false
	Value *int64 `json:"value"`
}

// swagger:model Item
type Item struct {
	Value *int64 `json:"value,omitempty"`
}

swagger2openapi --refSiblings allOf --yaml swagger.yaml | sed 's/x-nullable:/nullable:/g' > openapi3.yaml

redocly preview-docs openapi3.yaml

redocly build-docs openapi3.yaml