`CupyOps`: Simplify `asarray` (#661)
`CupyOps`: Simplify `asarray` (#661)

* `CupyOps`: Simplify `asarray`

* Remove `cast_array` flag and use `astype` unconditionally

* Revert unconditional call to `astype`

* Remove no-op
explosion/thinc,explosion/thinc,explosion/thinc,explosion/thinc