src/vs/workbench/contrib/notebook/common/model/notebookCellTextModel.ts/NotebookCellTextModel/mime
class NotebookCellTextModel:	public set mime(newMime: string | undefined) {
		if (this._mime === newMime) {
			return;
		}
		this._mime = newMime;
		this._hash = null;
		this._onDidChangeContent.fire('mime');
	}