BitArray pattern on JS target never matches despite being equal to the created value

[giacomocavalieri]

This code:

pub fn main() {
  echo case <<12:size(1)>> {
    <<12:size(1)>> -> 1
    _ -> 2
  }
}

Outputs 2 instead of 1 when ran on the JS target

[giacomocavalieri]

This is being worked on in #4382