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I think this is a minor formatting issue, related to arg vectors and other binding forms in a lot of the original Jira text, particularly code examples.
For instance, [^double x] gets coerced to (link: ^double x).
Edit:
As in https://ask.clojure.org/index.php/3317/support-type-hinted-overrides-of-function-parameters and https://ask.clojure.org/index.php/3326/cannot-create-anonymous-primitive-functions
I saw this pattern in the compiler tagged posts by jira, and divulged it may be an unintentional mechanical transform (no idea if it's widespread).
Can you point at an example?