Github user afs commented on the issue:
https://github.com/apache/jena/pull/449
There is no need to use the un-parenthesed form - it is a syntactic short
form and the full form can always be used. This may make the code generation
easier and have less at risk of misalignment.
```
SELECT * {
VALUES (?x) { (1) (2) (3) }
}
```
The query formatter does much the same - if it one variable, it uses the
short form, but it does not worry about the data being mis aligned:
It is the case of (illegal) `VALUES ?x { (1 2) (3) }` becoming treated as
`VALUES ?x { 1 2 3 }`.
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