if varr, _, err := ParseInputs(""); len(varr) > 0 || err != nil {
		t.Errorf(`ParseInput("") => got %v, %v, want nil, nil`, varr, err)
	}
	if _, _, err := ParseInputs("a"); err == nil {
		t.Error(`ParseInput("a") => got no error`)
	}
	if _, others, err := ParseInputs("apiVersion: v1\nkind: Pod"); err != nil || len(others) != 1 {
		t.Errorf(`ParseInput("kind: Pod") => got %v, %v`, others, err)
	}

Pass each subsystem a different Logger with its own group name so that
potential duplicates are qualified:

	logger := slog.Default().With("id", systemID)
	parserLogger := logger.WithGroup("parser")
	parseInput(input, parserLogger)

When parseInput logs with parserLogger, its keys will be qualified with "parser",
so even if it uses the common key "id", the log line will have distinct keys.

# Contexts