RuntimeDependency's compat entry missing from Project.toml

[omus]

The optional keyword argument compat can be used to specify a string for use in the Project.toml of the generated Julia package.

– https://docs.binarybuilder.org/stable/reference/#BinaryBuilderBase.RuntimeDependency

I was trying to add a RuntimeDependency for pandoc_crossref and have found that the compat entry is ignored.

Specifically I added:

RuntimeDependency(PackageSpec(name="pandoc_jll"), compat="=3.2.0")

and then ran:

julia build_tarballs.jl --verbose --deploy=local x86_64-linux-gnu && cat ~/.julia/dev/pandoc_crossref_jll/Project.toml

Which resulted in this Project.toml:

name = "pandoc_crossref_jll"
uuid = "f96e3c25-ae70-5588-8d8e-4a7ab3ba4c45"
version = "0.3.17+1"

[deps]
JLLWrappers = "692b3bcd-3c85-4b1f-b108-f13ce0eb3210"
pandoc_jll = "c5432543-76ad-5c9d-82bf-db097047a5e2"
Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
Artifacts = "56f22d72-fd6d-98f1-02f0-08ddc0907c33"

[compat]
JLLWrappers = "1.2.0"
julia = "1.6"
Libdl = "1"
Artifacts = "1"

[omus]

I also tried using top_level=true which didn't make a difference

[omus]

Encountered this problem while working on: JuliaPackaging/Yggdrasil#8892

[giordano]

This is of course not intended. If I have to blindly guess, perhaps something is going wrong during serialisation/deserialisation: https://github.com/JuliaPackaging/BinaryBuilderBase.jl/blob/406ec5c26348a7965cdc35aba15c03f84c02b525/src/Dependencies.jl#L341-L380. I thought this may be related to JuliaPackaging/Yggdrasil#8211, but in that case the package is added as Dependency, so I'm not sure anymore this is the same issue.