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Java collection types currently print as<pre>#&lt;ClassName {toString rep}&gt;</pre>As a result, their contents are not subject to control via Clojure's flags:<pre>*print-length*, *print-level*</pre>This is a big pain when working with big Java data at the REPL. I propose that, when their print forms are not overridden in derived classes, objects that implement the core Java collection interfaces print<ul><li>with the same rep as Clojure's persistent collections</li><li>subject to the various print binding flags</li></ul>Not in scope<ul><li>Per Rich's comment in the discussion, Java collections should not expose their type in print rep, so an array list should print as e.g.  <code style="font-size: 10.0pt;line-height: 13.0pt;">[1 2]</code> like any other sequential collection. </li><li>print-dup </li><li>Print/read roundtripping to a specific concrete type</li></ul>