SNEX span unsafe index?

[ustk]

Whatever I do, I get an unsafe access.
In a previous SNEX code, I used a normalised index for a safe LUT (span) access with no issues.
But here I am struggling with not a shred of explanation...

	span<Params, NB> models =
	{
		{0.0f, 0.0f, 0.0f},
		{0.0f, 0.0f, 0.0f}
	};

	using IndexType = index::clamped<NB, true>;
	
	Params currentModel;

	template <int P> void setParameter(double v)
	{
		if (P == Parameters::Model)
		{
			IndexType idx((int)v);
			currentModel = models[idx]; // unsafe access
		}
	}