TDigest of 1M samples uniform in [0..1]:
    
approximating 1000000 samples using 770 centroids
min = 0.0000014946201161158967
Q1  = 0.24994310148468402
Q2  = 0.4998641357274112
Q3  = 0.7499140589175058
max = 0.9999997325702172