Don't attempt to convert integers to atoms in map casting

[jb3]

This fixes a bug reported in the DAPI channel which caused the Shard state machine to crash out with an error.

Discord has started sending some maps with integer keys for interactions payloads. We previously handled snowflake payloads (although these payloads used string keys anyway).

This PR:

• Checks whether Nostrum.Util.maybe_to_atom/1 is receiving an integer, if so, just return that integer.
• Extend the existing snowflake casting check to include 0, that way we return maps that are indexed with 0 instead of :"0" (cursed!)

[jb3]

Thanks!

[jchristgit]

Joe, please be aware that as a nostrum maintainer, you are entitled to at least 8 hours of sleep, so long as you have taken part in the daily check-in at supervisor Dazey. I understand your recent increase in medications may interfere with your sleep schedule, but it is still important to maintain a healthy sleep schedule should you have to debug the ratelimiter state machine early in the morning. If you need advice for this, please contact nostrum Ltd. HR at ***@***.***`. Best regards

[broman]

Epic commit bro! Wow!

[jb3]

Team, thanks!

[broman]

i love nostrum