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> It would break some code
I think if it comes to simple scalar types like strings this would result in a migration nightmare.
Hence I wouldn't include the cases like $x.$y, <>, etc at least by default.
Refs on the other hand should be immutable, because the result is always junk.
But I doubt we have the resources to implement that anyway.
In reply to Re^5: Shouldn't references be readonly? (updated)