Naming bikeshed (because every proposal needs one)

[acutmore]

@johnnyreilly asks

Question: we have length for Arrays, and size for Sets. I'm used to count in other languages/APIs but I can't recall it in a JS context (maybe I'm misremembering). Would this become the third way to refer to amount contained if renamed to keysCount?

https://bsky.app/profile/johnnyreilly.com/post/3m5xldu4erk2z

[johnnyreilly]

Thanks @acutmore!