fix: convert the keys in the array to lowercase

[rise0chen]

fix #609

turn keys to lowercase to enable cross overrides not convert the keys in the array to lowercase. This PR fix it.

Before fix:

After fix:

[epage]

Is there an issue that this should be linking back to? We recommend any non-trivial (like beyond a typo) PRs to first start as issues so we make sure we have a mutual understanding the problem and the right direction to go in solving it.

When posting PRs, we also recommend the PR having at least two commits

1. A test showing the current behavior
2. The fix with the update to the test so it pass

The diff for the test makes it easy to verify tests are testing the right thing and make it very clear what the intended change is.

[rise0chen]

Before fix:

[rise0chen]

I have split it into two commits.

I haven't submit an issue, should I resubmit an issue?

[epage]

I haven't submit an issue, should I resubmit an issue?

Yes. PRs are not great places for discussing problems and potential solutions. They are much more likely to come and go and a lot of that background gets lost or bifurcated.

[rise0chen]

fix #609

[epage]

Going to close for now as we should consider other related issues like #531 in fixing issues introduced by #354.