_getfield_is_safe(oldtype, newtype, offset)
As in _view_is_safe, we need to check that memory containing objects is not reinterpreted as a non-object datatype and vice versa.
Data type of the original ndarray.
Data type of the field being accessed by ndarray.getfield
Offset of the field being accessed by ndarray.getfield
If the field access is invalid
Checks safety of getfield for object arrays.
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