validate the data. Validation can also be overriden
	on a per method level if desired.

	The ``formatVersion`` argument allows to specify the UFO format version as a tuple
	of integers (major, minor), or as a single integer for the major digit only (minor
	is implied as 0). By default the latest formatVersion will be used; currently it's
	3.0, which is equivalent to formatVersion=(3, 0).

	An UnsupportedUFOFormat exception is raised if the requested UFO formatVersion is
	not supported.
	Nú