es does not
        meet your needs, you should not need to worry about policies.
      </p>
<p>
        Policies are a compile-time mechanism that allow you to change error-handling
        or calculation precision either program wide, or at the call site.
      </p>
<p>
        Although the policy mechanism itself is rather complicated, in practice it
        is easy to use, and very flexible.
      </p>
<p>
        Using policies you can control:
      </p>
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