Fix trailing task precompilation issue on 1.9. Run CI on 1.9 (#1201)

* fix and test 1.9

* Update ci.yml

Author: IanButterworth

.github/workflows/ci.yml

@@ -23,6 +23,7 @@ jobs:
         version:
           - 'min'
           - 'lts'
+          - '1.9' # test because we know there was a precompilation issue on 1.9 issues/1202
           - '1' # automatically expands to the latest stable 1.x release of Julia
           - 'nightly'
         os:

src/precompile.jl

@@ -35,5 +35,6 @@ using PrecompileTools: @setup_workload, @compile_workload
     end
 
     HTTP.forceclose(server)
+    yield() # needed on 1.9 to avoid some issue where it seems a task doesn't stop before serialization
     server = nothing
 end