Unable to construct `ADNLPModel` with a matrix of linear constraints

Specific Domains Optimization (Mathematical)
3

Yes, that is exactly right - I’ve literally discovered this just now!

This throws the error:

params0 = [1.0, 0.1, 0.9]
A = sparse([
	0 -1 1 # integers here
])
problem = ADNLPModels.ADNLPModel(
	nll, params0,
	[0, 0, 0], # these are integers
        [Inf, Inf, 1],
	A, [0], [Inf] # 0 is an integer!
)

Change ints to float - and now it works:

A = sparse([
	0. -1 1 # note floating-point literal here
])
problem = ADNLPModels.ADNLPModel(
	nll, params0,
	[0, 0, 0.], [Inf, Inf, 1], # floats everywhere
	A, [0.], [Inf] # 0. is a float
)

IMO this is extremely confusing. The error message doesn’t say anything about element types at all.