kaidokert / fixed-bigint-rs / 30173978298

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Sign-extend PrimBits/PrimInt::signed_shr on both carriers (#156) (#189)

signed_shr did a logical right shift on both FixedUInt and HeaplessBigInt,
violating the PrimBits/PrimInt contract that it fill the vacated top bits from
the carrier's MSB — `(self as signed) >> n`. It was kept logical (and
consistent between carriers) in #154; this corrects it on both together.

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6314 of 6498 relevant lines covered (97.17%)

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