src/vs/editor/common/model/bracketPairsTextModelPart/bracketPairsImpl.ts/BracketPairsTextModelPart/_toFoundBracket
class BracketPairsTextModelPart:	private _toFoundBracket(bracketConfig: LanguageBracketsConfiguration, r: Range): IFoundBracket | null {
		if (!r) {
			return null;
		}

		let text = this.textModel.getValueInRange(r);
		text = text.toLowerCase();

		const bracketInfo = bracketConfig.getBracketInfo(text);
		if (!bracketInfo) {
			return null;
		}

		return {
			range: r,
			bracketInfo
		};
	}