We want to type setParams correctly for both the specific-screen and any-screen-on-a-navigator case. As a result, the type of setParams is incompatible between the two.
The previous diff handled Stack, which is used a lot in the app. This diff handles Tab, which is used less in the app... but since there are three ReactNav packages with Tab navigators, this diff involves more changes to the libdefs.
Depends on D5402