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struct Foo <: AbstractFloat x::Float64 end
Base.:(+)(x1::Foo, x2::Foo) = Foo(x1.x + x2.x)
Foo(1) + 1
ERROR: promotion of types Foo and Int64 failed to change any arguments
Base.promote_rule(::Type{Foo}, ::Type{S}) where {S <: Number} = Foo
Foo(1) + 1
# Foo(2.0)АО
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SELECT LAG(field) OVER (PARTITION BY p1, p2 ORDERED BY p3, p4)ХЛ
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