Cloning: the default choice is a deep copy (although be aware of memory usage).

Common options for handling errors:
	* Close program
	* Throw exception
	* Use a reasonable or neutral value
	* Log the error
	* Print the error
	* Do nothing
	[* Use an assert if you want an error thrown, but only during development]

Example of an assert (in Java, assertions are enabled by running it with the -ea flag)
	lat = ...  //calculation happens here

	//We want an error thrown if it's out of bounds, but only during development
	assert (lat >= -90 && lat <= 90) : "Latitude out of bounds";

	if (lat > 90) lat = 90;
	if (lat < -90) lat = -90;