Strange dispatch bug with ::Type, depends on order of function evaluations

[toivoh]

Running

f(::Any)=false
f(::Type)=true
@show  f((Int,String,2))
@show  f(((Int,String),String))
@show  f((Int,))
@show  f((Int,String))
@show  f(Int)

in a fresh julia session gives

f((Int,String,2)) => false
f(((Int,String),String)) => false
f((Int,)) => false
f((Int,String)) => false
f(Int) => true

But if we remove @show f((Int,String,2)) then it works as expected:

f(::Any)=false
f(::Type)=true
@show  f(((Int,String),String))
@show  f((Int,))
@show  f((Int,String))
@show  f(Int)

gives

f(((Int,String),String)) => true
f((Int,)) => true
f((Int,String)) => true
f(Int) => true

It seems like the negative result for @show f((Int,String,2)) somehow contaminates the further invocations.