Ah ok.  Yes, there are actually two ways to do it.

1) you can implement #maTransientVariables on any class to declare its
named inst-vars which should be ignored by Magma.  Just answer an
Array of the inst-var names (it can be calculated dynamically).  This
is the easiest solution to cause Magma to ignore particular object
links.

2) Your example was with Array though, which doesn't have named
inst-vars.  For that you would have to use a MaImmutabilityStrategy
which lets you specify objects to be immutable by a condition block.
It can even ignore a reference based on conditions of the *Referencer*
(e.g.,  the referencing object) instead of only the referenced object.
 See MagmaTestCase>>#commitWithImmutabilityStrategy for usage details.