struct SSOHashMapOrSet(K, V = void, alias Allocator = null, alias hasher = hashOf, uint smallBinMinCapacity = 1, uint capacityScaleNumerator = 2, uint capacityScaleDenominator = 1)
pragma(inline) 
enum smallBinCapacity = 
max(smallBinMinCapacity, LargeBin.sizeof / T.sizeof);
Maximum number of elements that fits in a small bin (SmallBin).