Apply a tokenwise block over the groups of a mixed forward: the groups that
may share it packed into one call of the class the caller named (packed),
a verify group (which keeps its projection geometry) and every group when
pack is off on its own rows, at its own class.
Apply a tokenwise block over the groups of a mixed forward: the groups that may share it packed into one call of the class the caller named (
packed), a verify group (which keeps its projection geometry) and every group whenpackis off on its own rows, at its own class.