Where a Lens can retrieve the value from a single slot within the data, often multiple, dispersed values will need to be extracted; multifocal lensing addresses this problem.
A multifocal lens can be built from either an Array of optics or an Object whose own properties contain optics. The result of getting through a multifocal lens is the same type as passed for constructing the multifocal.
While it is possible to xformInClone on a multifocal lens, the operation behaves differently than for lenses: the transformations are passed as an iterable of index/transform or key/transform pairs (i.e. 2-element Arrays) instead of passing a single transformation function. For each transformation element in order as presented by the iterable, the constituent Optic associated with the index or key is looked up from the multifocal lens and the transform function is passed to xformInClone of that object; if the index or key is not found in the multifocal's member optic container, no change to the result occurs for that transformation element.
While this difference of call interface might seem to indicate a different name would be better, by using the same xformInClone name, the transforms can be chained if a selected member optic of the multifocal is itself a multifocal.