Create `BigInt` directedly from MPZ pointer

General Usage
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I have some FFI code that interfaces with another library, and the target library has GNU multiprecision integers. Is it possible to create a BigInt directly from such a multiprecision integer pointer? The default constructor for BigInt is hidden, so I cannot construct a BigInt from limbs directly. julia/base/gmp.jl at 6d172b025e4befc4d274d9fbc9339917a8a86b65 · JuliaLang/julia · GitHub

mutable struct BigInt <: Signed
    alloc::Cint
    size::Cint
    d::Ptr{Limb}

    function BigInt(; nbits::Integer=0)
        b = MPZ.init2!(new(), nbits)
        finalizer(cglobal((:__gmpz_clear, libgmp)), b)
        return b
    end
end