Modify operation is similar to `make_mutable`, however, the `op` argument specifies the desired array operation, see \ref BLModifyOp. The pointer returned in `data_out` points to the first item to be either assigned or appended and it points to an uninitialized memory. Please note that assignments mean to wipe out the whole array content and to set the length of the array to `n`. The caller is re
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