public long getNumber(String key, long defaultValue) {
		Long val = getNumber(key);
		return val != null ? val : defaultValue;
	}
Returns the given value from this Configuration or its fallback

@param key          The key of the value to return
@param defaultValue The value to return if the key wasn't found
@return The associated value if it was found or `defaultValue` if not
src/main/java/dev/jbang/Configuration.java