In the online help document "Arbitrary Precision Arithmetic" section (http://docs.julialang.org/en/latest/manual/integers-and-floating-point-numbers/),
it uses `parse` to construct `BigInt`, and claims that promotion are not automatic. But in my experience (v0.3.11 and v0.4-dev), it is not the case. > 12345678901234567890123456789000000000000000 + 1 12345678901234567890123456789000000000000001 >typeof(ans) Base.GMP.BigInt
