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It appears that #1438 was in fact breaking for https://github.com/thofma/Hecke.jl/blob/75dbabf5ab7c863bba8fc233a85583b674211554/src/QuadForm/Quad/ZGenus.jl#L1600 in Hecke, as it removed the possibility to use
diagonal_matrix(::NCRing, ::Vector{<:MatElem})
with empty list of blocks.Thus, currently, Hecke master's CI is broken (but there have been no runs yet). I thus would like to have this patch here released shortly.