Compare at the first differing trit

Two numbers line up trit by trit; the first place from the top where they differ decides. The answer is itself a trit.

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Where the numbers come from

gHashTag/t27 specs/ternary/trits.t27 (t27#8979): every value on the page is its fn bodies, compiled to wasm (logic.js), with 18 tests and 4108 runtime asserts
D. Knuth, The Art of Computer Programming, vol. 2, section 4.1: balanced ternary