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Document the use of data: Some(b"") for clearing data #982

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Jun 24, 2021
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Document the use of data: Some(b"") for clearing data #982

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4 changes: 3 additions & 1 deletion SEMANTICS.md
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Expand Up @@ -292,7 +292,9 @@ to the caller of `execute` (either the client or another transaction), just as
if the original `execute` and returned `data: Some(b"better idea")`. If `reply`
returns `data: None`, it will not modify any previously set data state. If there
are multiple submessages all setting this, only the last one is used (they all
overwrite any previous `data` value).
overwrite any previous `data` value). As a consequence, you can use
`data: Some(b"")` to clear previously set data. This will be represented as a
JSON string instead of `null` and handled as any other `Some` value.

#### Order and Rollback

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