Flip every trit to negate, cut trits to round

Negation in balanced ternary flips every trit: no borrow, no complement. Cutting the lowest trits rounds to the nearest multiple.

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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