BTree.minDegree

Called "t" or "minimum degree" in litterature, can never be < 2. Make it lower (eg: 2) to test tree algorithms. See <digression> below to see why this is not B-Tree "order".

struct BTree(K, V, alias less = "a < b", bool allowDuplicates = false, bool duplicateKeyIsUB = false)
nothrow @nogc
enum minDegree = 16;

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