Function copyPropsSafely

date.js:197–203

(dst, src)

	}

	function copyPropsSafely(dst, src) {
		for (var p in src) {
			if (ownProp.call(src, p) && !ownProp.call(dst, p)) {
				dst[p] = src[p];
			}
		}
	}

	checkIsoCompat();