Fetch-Query in Studio and < > characters breaks the query

in the Studio, say you have Fetch > Query operation in a chain. Such as:

SELECT * FROM Document WHERE dc:created < DATE '2013-07-19'

At runtime, it does not work. The server complains, because "<" became "<"
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Caused by: org.nuxeo.ecm.core.query.QueryParseException: org.nuxeo.ecm.core.query.QueryParseException: Lexical Error: Illegal character <&> at offset 40 in query: SELECT * FROM Document WHERE dc:created < DATE '2013-07-19'
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I was testing with some custom field:
[...] AND activity:grade < 11

So, basically, the query statement is broken. I don't know if the responsibility goes to the Studio or to the runtime. Or both. As I'm writing the statement in the Studio, I gave this bug to the Studio

The workaround can be to use BETWEEN instead...
[...] AND activity:grade BETWEEN O AND 10
... but it's not natural.

That's why I set it to "critical" => I think it will break updates made by the customers (if they use such encoded characters)