Make `gen` portable#841

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amatgil wants to merge 9 commits intouiua-lang:mainfrom

Commits on Oct 23, 2025

rand -> rand_xoshiro for better reproducibility across archs

amatgil
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kaikalii
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Remember to return the generated value, not the upper bound :P

amatgil
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kaikalii
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Implement gen_range(-1..=1), seems to be more uniform than the previous way

amatgil
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kaikalii
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Make sure the random numbers are in the correct range

amatgil
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kaikalii
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Make site's `shuffle` call functional

amatgil
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kaikalii
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Seed from time properly

amatgil
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kaikalii
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Add two simple tests

amatgil
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kaikalii
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Tweak tests, use ahasher

amatgil
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kaikalii
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fix a clippy lint
kaikalii
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