setCustomIslamicCalendarData(aCustomCalendarData) {
			check(Array.isArray(aCustomCalendarData), "aCustomCalendarData must be an Array");
			const bFireEvent = !mChanges;
			mChanges ??= {};
			aCustomIslamicCalendarData = mChanges.customIslamicCalendarData = aCustomCalendarData.slice();
			if (bFireEvent) {
				fireChange();
			}
		}
Allows to specify the customizing data for Islamic calendar support

See: {@link module:sap/base/i18n/Formatting.CustomIslamicCalendarData}

@param {module:sap/base/i18n/Formatting.CustomIslamicCalendarData[]} aCustomCalendarData Contains the customizing data for the support of Islamic calendar.
One JSON object in the array represents one row of data from Table TISLCAL
@public
@since 1.120