LargeDeformation deformation gradient initialization
The following discussion from !4861 (merged) should be addressed:
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@chleh started a discussion: (+1 comment) A volume ratio of one would be consistent with a zero deformation gradient, wouldn't it?
Maybe better use 1 here and add a comment? We had a discussion about enforcing consistency by using setters for the values in the future.
NaN would be very safe option.