TDigest of 1M samples uniform in [0..1]:
    
approximating 1000000 samples using 769 centroids
min = 3.8216848463612507e-7
Q1  = 0.24969329815776772
Q2  = 0.4992678415704818
Q3  = 0.7500000483548416
max = 0.9999967964004768