vptr offset, i.e., the size of the INFO key plus size+type bytes indicates that vptr-vptr_off must be freed; set only when modified and the new data block is bigger than the original +//// vector length, 1 for scalar
See Implementation
vptr offset, i.e., the size of the INFO key plus size+type bytes indicates that vptr-vptr_off must be freed; set only when modified and the new data block is bigger than the original +//// vector length, 1 for scalar