Memory leak in quantile function

[johanvdw]

Running:

#!/usr/bin/env python3
import numpy as np
import datetime
from crick import TDigest 


td = TDigest()
for j in range(1000000):
    arr = np.array(1)
    td.update(arr)
    x = td.quantile(0.88)

Leads to this memory usage pattern: