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Clarify the illegal types

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Hsiao-Wei Wang 2019-07-10 16:46:59 +08:00
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@ -89,7 +89,7 @@ An SSZ object is called empty (and thus, `is_empty(object)` returns true) if it
### Illegal types
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).
The empty `List[subtype, N]`, `Vector[subtype, N]`, `Bitlist[N]`, and `Bitvector[N]` types, where `N == 0` are not legal. The `null` type is only legal as the first type in a union subtype (i.e. with type index zero).
## Serialization