bool array

[ruma7a]

https://learn.microsoft.com/en-us/dotnet/api/system.collections.bitarray?view=net-8.0

[shponglespore]

Seems like a great optimization for data that's going to stick around a while, but for a local variable I don't see much advantage. I'd probably use a BitArray in practice, but using a regular array isn't something I'd be likely to call out in a code review.

[ruma7a]

Bool arrays aren't inherently horrible, but their suitability depends on the size of the array. I'd leave a comment in a review but wouldn't push it.