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doc/go1.20: document math/rand autoseed and deprecation of Seed
Change-Id: Ie557f3841781ac47f4044a395106a2e5b13e9695 Reviewed-on: https://go-review.googlesource.com/c/go/+/452561 Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com>
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@ -612,12 +612,17 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="math/rand"><dt><a href="/pkg/math/rand/">math/rand</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/54880 -->
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TODO: <a href="https://go.dev/issue/54880">https://go.dev/issue/54880</a>: seed global generator randomly
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<p><!-- https://go.dev/issue/54880 --><!-- CL 436955 -->
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The <a href="/pkg/math/rand/">math/rand</a> package now automatically seeds
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the global random number generator
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(used by top-level functions like <code>Float64</code> and <code>Int</code>) with a random value,
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and the top-level <a href="/pkg/math/rand/#Seed"><code>Seed</code></a> function has been deprecated.
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Programs that need a reproducible sequence of random numbers
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should prefer to allocate their own random source, using <code>rand.New(rand.NewSource(seed))</code>.
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</p>
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<p><!-- CL 436955 -->
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TODO: <a href="https://go.dev/cl/436955">https://go.dev/cl/436955</a>: math/rand: deprecate Read
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<p>
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Programs that need the earlier consistent global seeding behavior can set
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<code>GODEBUG=randautoseed=0</code> in their environment.
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</p>
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</dd>
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</dl><!-- math/rand -->
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