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

		this._hash = hash([hash(this.getValue()), this.language, this.metadata, this.internalMetadata]);
		return this._hash;
	}