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rand: simplify rand.PRNG, move to optional types for error handling (#13570)
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@@ -142,7 +142,7 @@ fn random_number(length int) Integer {
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numbers := '0123456789'
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mut stri := ''
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for _ in 0 .. length {
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i := rand.intn(10)
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i := rand.intn(10) or { 0 }
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nr := numbers[i]
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stri = stri + nr.ascii_str()
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}
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