src/vs/editor/common/model/pieceTreeTextBuffer/pieceTreeTextBuffer.ts/PieceTreeTextBuffer/equals
class PieceTreeTextBuffer:	public equals(other: ITextBuffer): boolean {
		if (!(other instanceof PieceTreeTextBuffer)) {
			return false;
		}
		if (this._BOM !== other._BOM) {
			return false;
		}
		if (this.getEOL() !== other.getEOL()) {
			return false;
		}
		return this._pieceTree.equal(other._pieceTree);
	}