Adding tests for #27467 surfaced some bugs:
from pandas import * df = DataFrame(dict(a=[0, 0, 0, 1, 1, 1], b=range(6))) g = df.groupby(np.repeat([0,1], 3)) # ok g.quantile(50) <segfault>
quantile accepts floats in [0,1] or arrays of floats. It appears not to validate the range though.
