Make SignedShrinker bounded for <$ty>::MIN#296

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neithernut wants to merge 3 commits intoBurntSushi:masterfrom

neithernut:i32min-shrink-bound

Commits on Aug 9, 2021

impl: make SignedShrinker bounded for <$ty>::MIN
neithernut
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Commits on Aug 11, 2021

impl: simplify control flow in SignedShrinker
neithernut
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Commits on Aug 26, 2021

impl: make sure a float's shrinker does not yield the original value
neithernut
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