feedback: Add type on Redis-fetched data.
feedback: Add type on Redis-fetched data.

This brings type-checking to the last place we fetch
data from Redis, with the exception of our APNs code
which is being replaced (with a Redis-free version,
thanks to improvements in Apple's APNs API) shortly.

punchagan/zulip,verma-varsha/zulip,showell/zulip,hackerkid/zulip,jackrzhang/zulip,tommyip/zulip,rht/zulip,dhcrzf/zulip,andersk/zulip,zulip/zulip,shubhamdhama/zulip,brainwane/zulip,hackerkid/zulip,synicalsyntax/zulip,punchagan/zulip,kou/zulip,Galexrt/zulip,rht/zulip,mahim97/zulip,showell/zulip,eeshangarg/zulip,zulip/zulip,tommyip/zulip,jackrzhang/zulip,brainwane/zulip,Galexrt/zulip,punchagan/zulip,rht/zulip,rishig/zulip,brainwane/zulip,hackerkid/zulip,synicalsyntax/zulip,brainwane/zulip,kou/zulip,rht/zulip,tommyip/zulip,tommyip/zulip,mahim97/zulip,kou/zulip,synicalsyntax/zulip,showell/zulip,dhcrzf/zulip,kou/zulip,synicalsyntax/zulip,brockwhittaker/zulip,amanharitsh123/zulip,rishig/zulip,showell/zulip,punchagan/zulip,amanharitsh123/zulip,timabbott/zulip,eeshangarg/zulip,verma-varsha/zulip,timabbott/zulip,jackrzhang/zulip,zulip/zulip,rishig/zulip,andersk/zulip,mahim97/zulip,showell/zulip,timabbott/zulip,shubhamdhama/zulip,amanharitsh123/zulip,zulip/zulip,amanharitsh123/zulip,rht/zulip,jackrzhang/zulip,brainwane/zulip,zulip/zulip,brockwhittaker/zulip,dhcrzf/zulip,hackerkid/zulip,timabbott/zulip,brockwhittaker/zulip,rishig/zulip,mahim97/zulip,dhcrzf/zulip,brainwane/zulip,jackrzhang/zulip,tommyip/zulip,andersk/zulip,timabbott/zulip,tommyip/zulip,andersk/zulip,dhcrzf/zulip,Galexrt/zulip,synicalsyntax/zulip,jackrzhang/zulip,kou/zulip,synicalsyntax/zulip,jackrzhang/zulip,timabbott/zulip,shubhamdhama/zulip,zulip/zulip,rht/zulip,andersk/zulip,punchagan/zulip,brockwhittaker/zulip,showell/zulip,kou/zulip,verma-varsha/zulip,Galexrt/zulip,Galexrt/zulip,mahim97/zulip,eeshangarg/zulip,brockwhittaker/zulip,rishig/zulip,mahim97/zulip,synicalsyntax/zulip,amanharitsh123/zulip,shubhamdhama/zulip,verma-varsha/zulip,punchagan/zulip,punchagan/zulip,Galexrt/zulip,andersk/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,tommyip/zulip,rishig/zulip,amanharitsh123/zulip,rishig/zulip,dhcrzf/zulip,showell/zulip,shubhamdhama/zulip,shubhamdhama/zulip,brainwane/zulip,verma-varsha/zulip,eeshangarg/zulip,brockwhittaker/zulip,hackerkid/zulip,hackerkid/zulip,verma-varsha/zulip,hackerkid/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,shubhamdhama/zulip,dhcrzf/zulip,timabbott/zulip,Galexrt/zulip,eeshangarg/zulip