Fix not being able to decode large integers

[teh-cmc]

TODO: send this upstream

cargo -q t --no-default-features --features frame && cargo -q t --no-default-features --features frame --features safe-encode && cargo -q t --no-default-features --features frame --features safe-decode && cargo -q t --no-default-features --features frame --features safe-encode --features safe-decode

running 19 tests
...................
test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.27s


running 46 tests
i.............................................
test result: ok. 45 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 3.33s


running 9 tests
.........
test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.17s


running 20 tests
....................
test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s


running 46 tests
i.............................................
test result: ok. 45 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 4.79s


running 9 tests
.........
test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.18s


running 20 tests
....................
test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.41s


running 45 tests
i............................................
test result: ok. 44 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 3.94s


running 9 tests
.........
test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.17s


running 16 tests
................
test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.28s


running 45 tests
i............................................
test result: ok. 44 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 5.60s


running 9 tests
.........
test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.18s

[teh-cmc]

Oh, I thought this would run the github actions somehow. Welp, guess we're going straight to upstream.