== uses compareTo if groovy class is a comparable

class CP implements Comparable
{
int number

int compareTo(obj)

{ println 'compareTo called' return number - obj.number }

boolean equals(obj)

{ println 'equals called' return obj.number = number }

}

// script
def cp1 = new CP(number:1)
def cp2 = new CP(number:2)
cp1==cp2

// results
if CP implements Comparable, compareTo is called, if not, equals is called

// using grails with above as follows has ominous implications

I have a setup similar to as follows:
TopLevelDomainClass

{ SortedSet subLevels static hasMany= [subLevels:SubLevelDomainClass] }

SubLevelDomainClass implements Comparable
{
int number
int compareTo(obj)

{ return this.number - obj.number }

}

sublevel1==sublevel2 calls the compareTo function for evaluation

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