Enforce aligned packet loads and stores regardless of what is requested.
| ExpressionType | the type of the object of which we are forcing aligned packet access | 
This class is the return type of MatrixBase::forceAlignedAccess() and most of the time this is the only way it is used.
Inherits internal::dense_xpr_base::type.
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    https://eigen.tuxfamily.org/dox/classEigen_1_1ForceAlignedAccess.html