@nanosoldier runtests(ALL, vs = ":master")

I am moving the discussion to this PR from #44564. CC @nalimilan

I'm very sorry for the breakage!

No problem - that is why I am reporting.

The point is that - is different than * and + because in - you multiply by UInt8(-1) which will error if something is undefined, while * and + silently go-through even when they do not make sense to be allowed.

I do not insist on this PR, but I would want to have a conscious decision that we want to allow these operations (in DataFrames.jl I strictly test if nonsense operations error - that is how I got to this PR 😄).

Specifically in Julia 1.7, since addition of NamedTuple in general is disallowed then also:

julia> +(NamedTuple())
ERROR: MethodError: no method matching +(::NamedTuple{(), Tuple{}})

while after your PR:

julia> +(NamedTuple())
NamedTuple()

The point is that, in general you call addition like +(args...) and in generic code you do not know how many args you get. Previously if all args were NamedTuple the code always errored. Now it errors for more than one arg, but for one arg it works.

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