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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