src/vs/editor/common/model/mirrorTextModel.ts/MirrorTextModel/constructor
class MirrorTextModel:	constructor(uri: URI, lines: string[], eol: string, versionId: number) {
		this._uri = uri;
		this._lines = lines;
		this._eol = eol;
		this._versionId = versionId;
		this._lineStarts = null;
		this._cachedTextValue = null;
	}