TDigest of 1M samples uniform in [0..1]:
    
approximating 1000000 samples using 773 centroids
min = 5.439490833314409e-7
Q1  = 0.2499223004384659
Q2  = 0.49975402057237295
Q3  = 0.7497859270428641
max = 0.9999996912019149