scalar_bigint_roundtrip test failed

[greenhat]

---- sigma_protocol::dlog_group::tests::scalar_bigint_roundtrip stdout ----
thread 'sigma_protocol::dlog_group::tests::scalar_bigint_roundtrip' panicked at 'assertion failed: `(left == right)`
  left: `Scalar(Scalar4x64([12438879760993867047, 15668063604945817822, 4375183397110540183, 53500923189448437]))`,
 right: `Scalar(Scalar4x64([11513238136387086080, 8080818871156661932, 13242305237725190105, 13696236336498799932]))`', ergotree-ir/src/sigma_protocol/dlog_group.rs:219:9

[ApexTheory]

Found another case:

---- sigma_protocol::dlog_group::tests::scalar_bigint_roundtrip stdout ----
thread 'sigma_protocol::dlog_group::tests::scalar_bigint_roundtrip' panicked at 'assertion failed: `(left == right)`
  left: `Scalar(Scalar4x64([4041210275284044675, 6942116427424140532, 1121630985750299385, 4394074963199624]))`,
 right: `Scalar(Scalar4x64([1532162344980546304, 6294374344463021112, 10436371246433368416, 1124883190579103759]))`', ergotree-ir\src\sigma_protocol\dlog_group.rs:219:9

[greenhat]

Should be suppressed in #325 via limiting BigInt256 range in test.

[greenhat]

Experienced in rebased #346 (after #326 merge).

---- sigma_protocol::dlog_group::tests::scalar_bigint256_roundtrip stdout ----
thread 'sigma_protocol::dlog_group::tests::scalar_bigint256_roundtrip' panicked at 'assertion failed: `(left == r
ight)`
  left: `Scalar(Scalar4x64([12081056610554858139, 10753050667248866626, 17360340428558366986, 40113997526394505])
)`,
 right: `Scalar(Scalar4x64([12144231992548563712, 4216103832986665639, 17028572020649560725, 10269183366756993520
]))`', ergotree-ir/src/sigma_protocol/dlog_group.rs:223:9