[Upstream] Cannot switch to Laser-based tensors
Laser-based tensors use either a raw pointer to be able to plug in buffers coming from external libraries (Numpy, PyTorch, Tensorflow) and also exchange buffer with zero-copy. Or they use a seq for Nim ref types or strings.

https://github.com/mratsim/Arraymancer/blob/d3f078a6e577b232e2b1c8973add319f285fdd9e/src/laser/tensor/datatypes.nim#L12-L30

Unfortunately supportsCopyMem doesn't work properly in type section, making Laser Dead On Arrival :/. https://github.com/nim-lang/Nim/issues/13095