Widen JSON compat bound to include 1.x

[tmigot]

Summary

SolverBenchmark's JSON compat bound (0.20.0, 0.21.0) does not overlap with CUTEst.jl's JSON = "1.5" requirement (in place since CUTEst v1.3.8, released 2026-04-21, unchanged in the current v1.4.0). Because the bounds don't intersect at all, no environment can depend on both SolverBenchmark and a recent CUTEst simultaneously — Pkg's resolver reports "Unsatisfiable requirements detected for package JSON".

Concretely this breaks DCISolver.jl's docs build: docs/src/2-benchmark.md uses CUTEst (to select/load problems) together with SolverBenchmark (bmark_solvers, pretty_stats, performance_profile) on the same page, and that combination currently fails to resolve. See JuliaSmoothOptimizers/DCISolver.jl#193 (https://github.com/JuliaSmoothOptimizers/DCISolver.jl/actions/runs/31178054731).

Investigation

• The only use of the JSON package in src/ is JSON.parse in src/pkgbmark.jl's to_gist, which builds the gist payload later handed to GitHub.create_gist (which itself calls JSON.json(params) to serialize the request body).
• JSON.jl 1.x is a full rewrite, but JSON.parse's return value (JSON.Object{String,Any}) is still <: AbstractDict, matching the interface GitHub.jl expects. A standalone script replicating the exact to_gist code path round-trips correctly under JSON 1.6.1.
• No test in the suite exercises to_gist/JSON directly, so I additionally ran the full test suite (Pkg.test()) with JSON forced to resolve to 1.6.1 (clean git tree, since test_pkgbmark() requires one) — it passes identically to the JSON 0.21.4 baseline: Testing SolverBenchmark tests passed in both cases.

Change

Widen the JSON compat entry from "0.20.0, 0.21.0" to "0.20.0, 0.21.0, 1".

Test plan

• Full Pkg.test() passes with JSON resolved to 0.21.4 (clean tree baseline)
• Full Pkg.test() passes with JSON resolved to 1.6.1 (clean tree)
• Standalone script verifying to_gist's JSON.parse/JSON.json round-trip under JSON 1.6.1

🤖 Generated with Claude Code

https://claude.ai/code/session_01XqAvZUtSdcxUHuNfzJdkHZ

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[amontoison]

Claude is wrong here.

You have a compat entry CUTEst = 1.3 in the Project.toml of the documentation of DCISolver.jl.

Julia can install CUTEst 1.3.7 and the last release of SolverBenchmarks.jl.
It is what was done if you check the logs.
You have an overlap of compatible versions between CUTest >= 1.3 and SolverBencharks.jl >= 0.6.

The failure is related to the download of the SIF files because an old archive that was cached.

However, it is still a good idea to allow JSON 1 for the future.