Minor test failure on Cygwin in ComplexDoubleElement._pow_ #27461
Description
Since #27222 I get the following tiny failure on Cygwin:
sage -t --long src/sage/rings/complex_double.pyx
**********************************************************************
File "src/sage/rings/complex_double.pyx", line 1642, in sage.rings.complex_double.ComplexDoubleElement._pow_
Failed example:
(-2) ^ CDF(-0.5)
Expected:
4.329780281177467e-17 - 0.7071067811865476*I
Got:
4.329780281177466e-17 - 0.7071067811865475*I
**********************************************************************
1 item had failures:
1 of 19 in sage.rings.complex_double.ComplexDoubleElement._pow_
[331 tests, 1 failure, 2.42 s]
That is, it's just off in the representation of the last decimal place. I wish I could explain exactly where the difference comes from, but I think for this test it should suffice to just add a tolerance flag.
CC: @jdemeyer
Component: porting: Cygwin
Author: Erik Bray
Branch/Commit: 5a0f13d
Reviewer: Volker Braun
Issue created by migration from https://trac.sagemath.org/ticket/27461