Does it use SentinelArrays.jl somewhere? 
Jokes aside: JuliaHub does not show any dependents of SentinelArrays.jl which of course is also wrong since CSV.jl depends on it. So I used the snippet from here to find the direct dependents:
julia> collect(keys(reverse_deps("SentinelArrays")))
15-element Vector{String}:
"CSV"
"Parquet"
"ReadStatTables"
"Arrow"
"TableOperations"
"Avro"
"ChunkedCSV"
"Dagger"
"ImpedanceSpectroscopy"
"UnROOT"
"Parquet2"
"DTables"
"DataFrames"
"ChunkedBase"
"ChunkedJSONL"
I find that in total there are 2989 indirect dependents of SentinelArrays.jl.
Code
julia> using Pkg
julia> const ctx = Pkg.Types.Context();
julia> function reverse_deps(name) # from the linked topic
nuuid = Pkg.Types.registered_uuid(ctx.registries, name)
dd = Dict{String,Base.UUID}()
isnothing(nuuid) && "$name not known"
for reg in Pkg.Registry.reachable_registries()
for (uuid, regpkg) in reg
pkg = Pkg.Registry.registry_info(regpkg)
deps = reduce(merge, values(pkg.deps), init=Dict{String,Base.UUID}())
x = get(deps, name, nothing)
if !isnothing(x) && x == nuuid
dd[regpkg.name] = uuid
end
end
end
dd
end
julia> function recursive_dependents(rootname)
todo = reverse_deps(rootname)
alldeps = empty(todo)
while length(todo) > 0
name, uuid = pop!(todo)
name in keys(alldeps) && continue
alldeps[name] = uuid
new = reverse_deps(name)
todo = merge!(todo, new)
end
return alldeps
end
julia> all = recursive_dependents("SentinelArrays")
Dict{String, Base.UUID} with 2989 entries:
"TopoPlots" => UUID("2bdbdf9c-dbd8-403f-947b-1a4e0dd41a7a")
"Foresight" => UUID("c6e1034d-1844-4b96-abf2-c5824a5aa8c3")
"BloqadeGates" => UUID("9b473568-af80-491c-8f51-e251334462c1")
"BifurcationKit" => UUID("0f109fa4-8a5d-4b75-95aa-f515264e7665")
"DrelTools" => UUID("fc805444-c5ec-4e06-bf74-6216be16ab28")
"Ai4EComponentLib" => UUID("9901752a-13b3-47c7-8fb4-ce17182539d9")
"Lectionary" => UUID("6244d477-9cf0-4e07-8f6b-f8ee26bc0292")
"PowerModelsONM" => UUID("25264005-a304-4053-a338-565045d392ac")
"Avalon" => UUID("d462d321-1585-4840-9f3e-06f5c1b6ea25")
"GigaSOM" => UUID("a03a9c34-069e-5582-a11c-5c984cab887c")
"ODMXMLTools" => UUID("2456a17b-6ca2-4f51-9342-f0287e829718")
"RestrictedBoltzmannMachines" => UUID("12e6b396-7db5-4506-8cb6-664a4fe1e50e")
"Treebanks" => UUID("64f30800-8bfd-42c1-8d67-a0fe2fc2f5f5")
"Trixi2Vtk" => UUID("bc1476a1-1ca6-4cc3-950b-c312b255ff95")
"BeastUtils" => UUID("af749cb1-4ea1-40dc-96cd-a9902a2c5721")
"AlgebraicDynamics" => UUID("5fd6ff03-a254-427e-8840-ba658f502e32")
"PosteriorPlots" => UUID("196f2941-2d58-45ba-9f13-43a2532b2fa8")
"JqData" => UUID("4296d2f8-d960-4a51-97e7-b097944e4d59")
"FeatherLib" => UUID("409f5150-fb84-534f-94db-80d1e10f57e1")
"RateTables" => UUID("d40fb65e-c2ee-4113-9e14-cb96ca0acb32")
"IntervalConstraintProgramming" => UUID("138f1668-1576-5ad7-91b9-7425abbf3153")
"ScTenifold" => UUID("fcca1770-266e-4af5-8612-876362e279e9")
"Simulate" => UUID("7fe0908f-881e-4672-99a3-35ccdc95dcfc")
"Solaris" => UUID("c31bc6c7-79d6-424e-a85f-5b42ee086500")
"RvSpectMLPlots" => UUID("6ad363e8-653f-4efd-a04b-f033e69a984c")
"DynamicalSystemsBase" => UUID("6e36e845-645a-534a-86f2-f5d4aa5a06b4")
"CurrentPopulationSurvey" => UUID("d0231af6-78e7-4e9e-9602-dcd107aeccbe")
"QSimulator" => UUID("84ebd660-cff8-11e8-33d2-5334dd07f13c")
â‹® => â‹®