src/vs/editor/common/model/textModel.ts/TextModel/getCharacterCountInRange
class TextModel:	public getCharacterCountInRange(rawRange: IRange, eol: model.EndOfLinePreference = model.EndOfLinePreference.TextDefined): number {
		this._assertNotDisposed();
		return this._buffer.getCharacterCountInRange(this.validateRange(rawRange), eol);
	}