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Yes, I do have an objection.

On execution, either:
1. The interpreter would necessarily have to ask the
question "is this shift value positive or negative" in order
to possibly change which operation is to be executed.
2. Every shift operator would need to be rewritten to
support negative shift values.

Both of these solutions add compexity to what has been
historically (in all languages) a very simple operation, and
as the zen says "Simple is better than complex."

-1