src/vs/editor/common/model/pieceTreeTextBuffer/pieceTreeBase.ts/Piece/constructor
class Piece:	constructor(bufferIndex: number, start: BufferCursor, end: BufferCursor, lineFeedCnt: number, length: number) {
		this.bufferIndex = bufferIndex;
		this.start = start;
		this.end = end;
		this.lineFeedCnt = lineFeedCnt;
		this.length = length;
	}