TDigest of 1M samples uniform in [0..1]:
    
approximating 1000000 samples using 771 centroids
min = 4.200588832325991e-8
Q1  = 0.24987952742888578
Q2  = 0.4997855957564563
Q3  = 0.7499832593116439
max = 0.9999997110076575