This is slightly magical but reduces `LengthSleb128` to known `LengthUleb128`: [lengthsleb.patch](/uploads/400b0160c075ee0ff5194667da26a549/lengthsleb.patch) _Update._ This makes `EncodeSleb128` slightly shorter and not really more magical: [encodesleb.patch](/uploads/9f1ee7b7fee4e7056367d66b21d040ad/encodesleb.patch)