src/vs/workbench/contrib/notebook/common/services/notebookSimpleWorker.ts/MirrorCell/getComparisonValue
class MirrorCell:	getComparisonValue(): number {
		if (this._primaryKey !== null) {
			return this._primaryKey!;
		}

		this._hash = hash([hash(this.language), hash(this.getValue()), this.metadata, this.internalMetadata, this.outputs.map(op => ({
			outputs: op.outputs.map(output => ({
				mime: output.mime,
				data: bufferHash(output.data)
			})),
			metadata: op.metadata
		}))]);
		return this._hash;
	}