Fiber pool not being use for nested Rack apps?

[eliaslevy]

Maybe I am being thick, but I think the following should work:

app = Rack::Builder.new do
use( Rack::FiberPool, :size => 50 )
map( '/app1' ) { call app1 }
map( '/app2' ) { call app2 }
end

Alas, it doesn't. The pool size limit is not applied to either app1 or app2. It seems I must call use( Rack::FiberPool, :size => 50 ) within each map block, which will create two different fiber pools, rather than a single one for all requests.

Is this expected? I am not understanding how Rack Builder work?