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Trim leading zero digits before allocating results for non-negative
int&and^operations. Return zero and one-digit results directly, and skip redundant normalization for non-negative results.Add tests for cancellation, unequal operand lengths and digit boundaries.
For
a = 1 << (30 * 8192), peak memory traced duringa ^ adrops from 32,796 bytes to 0 on a debug build with 30-bit digits.long_bitwise: eliminate temporary allocations for negative ints and fast-path non-negative ops #161075