Looks like a reasonable enhancement to me. I have filed ticket CLJ-1287
with a proposed patch for it:
http://dev.clojure.org/jira/browse/CLJ-1287
No guarantees when or if it will get into Clojure. You can modify your own
local copy of select-keys (or even alter-var-root its definition) if you
would like the new behavior sooner, for yourself.
By the way, there is a funjible.set library published on Github that is
like clojure.set except it has preconditions that its arguments are sets or
maps, the functions have longer more explicit doc strings, and there are a
few behavior changes like ensuring metadata or sortedness of return values.
https://github.com/jafingerhut/funjible
Andy
On Thu, Oct 31, 2013 at 7:21 PM, Don Jackson <
[email protected]> wrote:
>
> select-keys currently returns a regular hash-map, regardless of the kind
> of map provided as the input argument.
>
> Alternately, select-keys could call empty on it’s map argument to obtain
> the map it will return, thereby preserving the type of map provided.
>
> FYI, Mark Engelberg recently pushed a change to data.priority-map that
> ensures that the specific flavor of priority-map is preserved through calls
> to empty…
>
>
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