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The following code gives me weird KeyError: ((None,), ())

from sage.modules.free_module_integer import IntegerLattice                                                                                                                                                                                                               
L = IntegerLattice([[-1,  0,  1],[1,0,2]])                                                                                                                                                                                                                                
L.closest_vector((1,1,1))

I see it even at SageCell - https://sagecell.sagemath.org/?q=bznwmz

What is wrong?

The following code gives me weird KeyError: ((None,), ())

from sage.modules.free_module_integer import IntegerLattice                                                                                                                                                                                                               
L = IntegerLattice([[-1,  0,  1],[1,0,2]])                                                                                                                                                                                                                                
L.closest_vector((1,1,1))

I see it even at SageCell - https://sagecell.sagemath.org/?q=bznwmz

What is wrong?

The following code gives me weird KeyError: ((None,), ()) followed by AttributeError: 'sage.symbolic.expression.Expression' object has no attribute 'ceil'

from sage.modules.free_module_integer import IntegerLattice                                                                                                                                                                                                               
L = IntegerLattice([[-1,  0,  1],[1,0,2]])                                                                                                                                                                                                                                
L.closest_vector((1,1,1))

I see it even at SageCell - https://sagecell.sagemath.org/?q=bznwmz

What is wrong?

The following code gives me weird KeyError: ((None,), ()) followed by AttributeError: 'sage.symbolic.expression.Expression' object has no attribute 'ceil'

from sage.modules.free_module_integer import IntegerLattice                                                                                                                                                                                                               
L = IntegerLattice([[-1,  0,  1],[1,0,2]])                                                                                                                                                                                                                                
L.closest_vector((1,1,1))

I see it even at SageCell - https://sagecell.sagemath.org/?q=bznwmz

What is wrong?