[julia-users] typealias vs. const

[Steven G. Johnson]

Given a type T, what is the difference in practice between
     typealias A T
and 
     const A = T
?

There seems to be some disagreement over which one to use 
(e.g. 
https://github.com/JuliaLang/Compat.jl/commit/8211e38ac7d8448298a2bb3ab36d6f0b6398b577).

My impression is that there is no difference, and that the only advantage 
of a typealias is that it can be parameterized.  Is that right?

If they are equivalent, what is the Julian style?  Even in Julia Base it 
doesn't seem to be entirely consistent.