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Union default values

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Dankrad Feist 2019-05-01 15:12:49 +01:00
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specs/simple-serialize.md
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@ -61,11 +61,11 @@ For convenience we alias:
### Default values
The default value of a type upon initialization is recursively defined using `0` for `"uintN"`, `False` for `"bool"`, and `[]` for lists.
The default value of a type upon initialization is recursively defined using `0` for `"uintN"`, `False` for `"bool"`, and `[]` for lists. Unions default to the first type in the union (with type index zero), which is `"null"` if present in the union.
### Illegal types
Empty vector types (i.e. `[subtype, 0]` for some `subtype`) are not legal. The `"null"` type is only legal as a union subtype.
Empty vector types (i.e. `[subtype, 0]` for some `subtype`) are not legal. The `"null"` type is only legal as the first type in a union subtype (i.e., with type index zero).
## Serialization