Re: [heycam/webidl] Add bigint type (#525)

annevk commented on this pull request.



> @@ -6529,6 +6579,19 @@ Each pair of [=flattened member types=]
 in a [=union type=], <var ignore>T</var> and <var ignore>U</var>,
 must be [=distinguishable=].
 
+<p class="advisement" id="limit-bigint-numeric-unions">
+It is possible to create a union of {{bigint}} and a [=numeric type=].
+However, this is generally only supposed to be used for interfaces such as
+[[ECMA-402#numberformat-objects|NumberFormat]], which formats the values rather than using them in
+calculations.
+It would not be appropriate to accept such a union, only to then convert values of the
+[=numeric type=] to a {{bigint}} for further processing, as this runs the risk of introducing
+precision errors.
+Please
+<a href="https://github.com/heycam/webidl/issues/new?title=Intent%20to%20use%20bigint/numeric union">file an issue</a>
+to discuss before using this feature.

```suggestion
before using this feature.
```

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