messaging: fix vector serialization
messaging: fix vector serialization

Hold on U with do_with since having it in capture is incorrect in case
lambda is moved.

phonkee/scylla,asias/scylla,shaunstanislaus/scylla,eklitzke/scylla,duarten/scylla,tempbottle/scylla,scylladb/scylla,linearregression/scylla,duarten/scylla,rentongzhang/scylla,scylladb/scylla,capturePointer/scylla,victorbriz/scylla,shaunstanislaus/scylla,rluta/scylla,dwdm/scylla,dwdm/scylla,linearregression/scylla,gwicke/scylla,justintung/scylla,capturePointer/scylla,kjniemi/scylla,raphaelsc/scylla,glommer/scylla,respu/scylla,glommer/scylla,justintung/scylla,stamhe/scylla,duarten/scylla,scylladb/scylla,gwicke/scylla,phonkee/scylla,shaunstanislaus/scylla,tempbottle/scylla,glommer/scylla,wildinto/scylla,rluta/scylla,rluta/scylla,senseb/scylla,raphaelsc/scylla,phonkee/scylla,capturePointer/scylla,stamhe/scylla,kangkot/scylla,asias/scylla,acbellini/scylla,aruanruan/scylla,respu/scylla,rentongzhang/scylla,kjniemi/scylla,senseb/scylla,guiquanz/scylla,guiquanz/scylla,raphaelsc/scylla,senseb/scylla,linearregression/scylla,aruanruan/scylla,aruanruan/scylla,avikivity/scylla,wildinto/scylla,kangkot/scylla,gwicke/scylla,bowlofstew/scylla,rentongzhang/scylla,avikivity/scylla,eklitzke/scylla,wildinto/scylla,bowlofstew/scylla,stamhe/scylla,eklitzke/scylla,kangkot/scylla,avikivity/scylla,guiquanz/scylla,scylladb/scylla,victorbriz/scylla,acbellini/scylla,acbellini/scylla,justintung/scylla,kjniemi/scylla,victorbriz/scylla,respu/scylla,dwdm/scylla,asias/scylla,bowlofstew/scylla,tempbottle/scylla