Balanced ternary: count with -1, 0 and +1

Step a number up and down and watch its trits change. Every integer, negative ones too, has one form with no sign symbol.

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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
N. P. Brusentsov and others, the Setun computer, Moscow State University, 1958: a working balanced-ternary machine