- grow now accounts for bit index + 1 when computing required byte length to avoid off-by-one at byte boundaries
- contains/remove use explicit bounds checks (idx >= this.bits.length) instead of relying on truthy checks
- and clears tail bytes not covered by the shorter operand
- or/xor expand the result to encompass a longer operand so all bits are preserved
- update behavior to be more predictable and safer; tests pass
Eugene
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