Fix SetPath writes through typed nil maps

[00200200]

SetPath panics with assignment to entry in nil map when a typed nil map[string]interface{} is stored at the root or encountered along a path. For example, after j.SetPath(nil, map[string]interface{}(nil)), j.SetPath([]string{"value"}, "set") panics instead of creating the object.

Treat nil maps like other values that need an object allocated before descending or writing. Regression cases cover root maps, nested maps, intermediate path creation, retrieval, encoding, and preservation of sibling keys.

Validation (Go 1.27.1, macOS arm64):

• Before the fix, the root and child regression cases independently panic.
• After the fix, targeted SetPath/path tests and go test -race -count=1 ./... pass.
• go vet ./..., gofmt, and git diff --check pass.

AI disclosure: prepared and checked with OpenAI Codex. No personal human review was performed. Validation is local and automated; no live services or downstream applications were tested.

[qodo-for-bitly]

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)

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