Meta keys can be incorrect when there is an empty string property

[ericallam]

Recently tracked down this weird edge case where there is a nested object with a key that is an empty string and the value is [{}] resulting in meta keys being incorrect after the serialization encounters it. I've added this test case that recreates it.

The offending data here:

const edgeCase = { 
 nested: {
    '': [{}],
     bigint: BigInt(1),
  },
}

The expected value is

'{"nested":{"":[{}],"bigint":"1"},"__meta__":{"nested.bigint":"bigint"}}'

But the actual is:

'{"nested":{"":[{}],"bigint":"1"},"__meta__":{"bigint":"bigint"}}'

My guess is that there is somewhere doing a conditional on the "" value which will return false.

[valstu]

So you beat me at debugging, came here to make the exact same issue 😄

[kiliman]

Thanks for the bug report. I never considered empty keys before.