steakhal added a comment. I spent some time on this patch. But I'm left thinking about why we need the extra indirection? Couldn't we just use a `std::pair<sym,width>` pair as a key instead? You mention //effective// bitwidths in your summary, but the code does not mention this concept. Maybe you could elaborate on what //effective// bitwidth means in this context and how this changes the eqclass lookups. In addition to this, I'd be curious about an informal proof of the correctness.
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