Cool, I opened: http://dev.clojure.org/jira/browse/CLJS-880

Thanks, Francis. I wondered if there was a singleton involved. The
intersection of "singletons for common values" and "mutable singletons" is
scary :)

On Sat, Nov 1, 2014 at 3:05 AM, David Nolen <[email protected]> wrote:

> A bug. Open a ticket in JIRA.
>
>
> On Saturday, November 1, 2014, Marcus Lewis <[email protected]> wrote:
>
>> Hi, I got bit by some pretty surprising behavior:
>>
>> my.ns> (defprotocol IFoo)
>> my.ns> (satisfies IFoo {})
>>   false
>> my.ns> (specify! {} IFoo)
>> my.ns> (satisfies IFoo {})
>>   true
>>
>> The IFoo specification leaks onto all other equal-valued instances. As a
>> result, one of my functions was overwriting this specification for all
>> existing instances with a single specify!.
>>
>> Non-empty collections behave as expected:
>>
>> my.ns> (defprotocol IFoo)
>> my.ns> (satisfies IFoo {:a "a"})
>>   false
>> my.ns> (specify! {:a "a"} IFoo)
>> my.ns> (satisfies IFoo {:a "a"})
>>   false
>>
>> Thoughts? Known issue?
>>
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