add a small precompile workload (#226)

Author: KristofferC

src/Downloads.jl

@@ -465,4 +465,15 @@ function default_downloader!(
     end
 end
 
+# Precompile
+let
+    d = Downloader(; grace=0.01)
+    download("file://" * @__FILE__; downloader=d)
+    # Ref https://github.com/JuliaLang/julia/issues/49513
+    # we wait for the grace task to finish
+    sleep(0.05)
+    precompile(Tuple{typeof(Downloads.download), String, String})
+    precompile(Tuple{typeof(Downloads.Curl.status_2xx_ok), Int64})
+end
+
 end # module