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mirror dict note about insertion order for keyset #9384

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mirror dict note about insertion order for keyset #9384

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3 changes: 2 additions & 1 deletion hphp/hack/manual/hack/08-arrays-and-collections/05-vec-keyset-and-dict.md
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Expand Up @@ -79,7 +79,8 @@ $items is vec<_>; // true
A `keyset` is an ordered data structure without duplicates. It is
created with the `keyset[]` syntax.

A `keyset` can only contain `string` or `int` values.
A `keyset` can only contain `string` or `int` values. `keyset`s are
ordered according to the insertion order.


```Hack
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