Attempting to:

  Smalltalk = Smalltalk

takes an incredible long time (hours) and causes the image to consume
copius amounts of memory before I finally killed it.

Why do this?  Serialization testing.

This changeset fixes the problem by adding a guard to the beginning of
Dictionary>>#=.

= aDictionary
	"... comment omitted for brevity ..."

	self == aDictionary ifTrue: [ ^ true ].
	...

A Dictionary is always equivalent to itself, right?  All SUnits passed
with this change.

Thanks,
  Chris
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