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In working on #27130 I'm finding we have a number of kludges where we check for operator names instead of operator identity because we haven't imported ops.radd, ops.rsub, etc. This is in general because of circularity-avoidance. So this PR breaks off those function definitions into roperator.py in a new core.ops directory.
In a follow-up, parts of core.missing devoted to handling division by zero will belong in core/ops/