How does gc work for Scratch spaces?

[fonsp]

Hi!

I am wondering how gc works for Scratch objects, exactly when will they get deleted? I have two specific questions:

1. Per object?

My package uses two objects, with:

module MyPackage
public f1, f2

function f1()
    Scratch.@get_scratch!("one")
end

function f2()
    Scratch.@get_scratch!("two")
end
end

A user called MyPackage.f1 recently, MyPackage.f2 two weeks ago, and never since. Will "two" get deleted when the user does gc? Or is it an all-or-nothing situation, where the objects only get deleted if the entire package MyPackage is not used in the past week?

2. collect_delay=Second(1) leaves some scratch spaces

I called Pkg.gc(collect_delay=Second(1)) in a terminal and I was surprised that some scratch spaces were still there. The .julia/scratchspaces folder still has three subfolders (from Pluto, Makie and Pkg I believe). Is this expected? I assumed that collect_delay=Second(1) would cause all scratch spaces to get deleted, since nothing was used in the past second.

Thanks! Let me know if my questions are unclear :) ☀