sqrt and log of rational series

[Sergey-A-Dovgal]

It seems that if one of the coefficients of a rational power series is a non-integer then the condition that the constant term is one, fails.

Example.

import flint

QQ = flint.fmpq
log = flint.fmpq_series.log

# this one works ok
print(log(flint.fmpq_series([1,1])))

# here is I get ValueError: log() of power series: constant term must be one
print(log(flint.fmpq_series([1,1,QQ(3,8)])))

The same goes with sqrt.

My best guess is that it is because fmpq series is represented as a fraction, and it thinks that the leading term is equal to 8.

My flint version is 2.7.1, and python-flint is 0.3.0

Cheers