For "pattern syntax" in Case and Value.matches it's not obvious where the least significant bit is in the pattern (first or last character in the string).
It would be nice if the documentation for these functions mentioned the ordering for this.
It might be a silly idea, but I think the order would be more obvious if the string format had an 0b prefix, showing most significant bit first like a Python integer; I don't know how to demonstrate little-bit-endian first like that however.
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I think this is a relatively straightforward documentation improvement? Just to confirm the desire is that the bit on the left of the pattern is MSB and the right is LSB of the value? I believe this matches the way it's implemented.
When matching against a Python integer, one would use something like m.Case(0bxy), where x is most significant first, so it seems most natural to me to have the leftmost bit be most significant in the pattern syntax too.