static _setBrackets(settings) {
        if (AutoNumericHelper.isNull(settings.negativeBracketsTypeOnBlur)) {
            settings.firstBracket = '';
            settings.lastBracket  = '';
        } else {
            // Use temporary variables to fix the MS Edge destructuring issue (see pull request #564)
            const [firstBracket, lastBracket] = settings.negativeBracketsTypeOnBlur.split(',');
            settings.firstBracket = firstBracket;
            settings.lastBracket = lastBracket;
        }
    }
Analyze the `negativeBracketsTypeOnBlur` options and keep track of the first and last bracket characters to use.

@param {object} settings
@private