Update specs/simple-serialize.md

Co-Authored-By: dankrad <dankrad@ethereum.org>
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Hsiao-Wei Wang
2019-05-01 12:39:44 +02:00
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@@ -45,6 +45,8 @@ This is a **work in progress** describing typing, serialization and Merkleizatio
* **union**: union type containing one of the given subtypes
* round bracket notation `(type1, type2, ...)`, e.g. `("uint64", "null")`
#### Variable-size and fixed-size
We recursively define "variable-size" types to be lists and unions and all types that contain a variable-size type. All other types are said to be "fixed-size".
#### Illegal empty composites