Correction, smart-matching is the one with the broken design. I think given/when's only problem is that they sometimes use smart-matching. But without smart-matching, there's not much point to given/when. For example, the OP would avoid given/when by making nothing but the following changes:

In reply to Re^3: Efficient way to verify scalar contents (updated x3) by ikegami
in thread Efficient way to verify scalar contents by x_stream3m

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