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IDL: nat <: int #479

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Jun 6, 2019
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IDL: nat <: int #479

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IDL: nat <: int
nomeata Jun 6, 2019
501c2d3
Merge branch 'master' into joachim/idl-nat-int
mergify[bot] Jun 6, 2019
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10 changes: 9 additions & 1 deletion design/IDL.md
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Expand Up @@ -517,13 +517,21 @@ Future extensions: defaults, including for variants?

#### Primitive Types

A primitive type cannot be changed in an upgrade.
Most primitive types cannot be changed in an upgrade.
```

------------------------
<primtype> <: <primtype>
```

An exception are integers, which can be specialised to natural numbers:

```

-----------
nat <: int
```

An additional rule applies to `unavailable`, which makes it a top type, i.e., a supertype of every type.
```

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