Local node inheritance ignores internal nodes sometimes

[dakusui]

• Input

{
  "$local": {
    "database_default": {
      "server": {
        "ip": "192.168.1.5",
        "port": 2000
      },
      "db_name": "test",
      "user": {
        "name": "root",
        "password": "root"
      }
    }
  },
  "foo_database": {
    "$extends": "database_default",
    "server": {
      "port": 2001
    },
    "db_name": "foo",
    "user": {
      "password": "foo_root"
    }
  }
}

• Expectation

{
  "foo_database": {
    "server": {
      "ip": "192.168.1.5",
      "port": 2001
    },
    "db_name": "foo",
    "user": {
      "name": "root",
      "password": "foo_root"
    }
  }
}

• Actual output

jq: error (at <stdin>:1): Cannot iterate over string ("database_d...)
{
  "foo_database": {
    "server": {
      "port": 2001
    },
    "db_name": "foo",
    "user": {
      "password": "foo_root"
    }
  }
}

[dakusui]

This was not bug...

    "$extends": "database_default",

should have been

    "$extends": ["database_default"],

The message is not straight forward, but it's also not a bug because you can do --validate=strict.