Auto conversion for type constructor doesn't work for parameter types

General Usage
1

Does auto conversion for type constructor not work for parameter types on purpose?

immutable A
    x::Float64
    y::Int
end
A(1, 2) # Works

immutable B{T}
    x::Float64
    y::Vector{T}
end
B(1, [2]) # Error
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2

Note that this works:

julia> B{Int}(1, [2])
B{Int64}(1.0,[2])

This outer constructor is missing:

julia> B{T}(x,y::Vector{T}) = B{T}(x,y)
B

julia> B(1, [2])
B{Int64}(1.0,[2])

Related Constructor with partially specified type parameters fails to fallback to convert method · Issue #18203 · JuliaLang/julia · GitHub, https://github.com/JuliaLang/julia/issues/17186

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