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simplify the code base using x[a:b] sugar (#868)

* update priority test

note it would be nice that iter can also benefit from view syntax sugar,
for example
iter.take(2) --> iter[:2]
the problem is that our current sugar iter[:] would require x.length, we should change the protocol to be
something like `op_as_view(~start:Int = 0, ~end: Int? = None)` the first defaults to 0, the second defaults to None, it is up to the user to interpret how it works

* use the array view sugar

* use array view syntax

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Co-authored-by: bob.hongbo.zhang <bob.hongbo.zhang@idea.edu.cn>

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