Hello,

I have COIN-OR installed on my computer and hence MILP chooses it as a
default:
{{{
sage: default_mip_solver()
'Coin'
}}}
(it would have been GLPK otherwise)

It is annoying since as a consequence the following fails:
**********************************************************************
File "src/doc/en/thematic_tutorials/linear_programming.rst", line 432,
in doc.en.thematic_tutorials.linear_programming
Failed example:
     p.solve()  # rel tol 2e-12
Expected:
     2.0
Got:
     2.0000000000040004
Tolerance exceeded:
     2.0 vs 2.0000000000040004, tolerance 2e-12 > 2e-12
**********************************************************************

In particular, all MILP related doctests are highly dependent on the
machine installation!

Vincent

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