> or to constrain argument types, e.g.
> myfun{T}(a::Poly{T}, b::Poly{T}) = a+b # a and b must be Polys of the same
> type
which is better expressed as :
myfun{P<:Poly}(a::P, b::P) = a+b
So a better example:
myfun{T}(a::Poly{T}, b::Monomial{T}) = ...
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