Using InstanceGenerator, only the last annotation on an interface method is inherited no matter how many there are

[delocalizer]

e.g. if interface has this:

    @RdfProperty(":wasDerivedFrom")
    @OneToMany(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    public Collection getWasDerivedFrom();

Then implementation has only OneToMany annotation, not RdfProperty:

groovy:000> for (Object m:generatedImpl.class.getMethods()) { println "${m.name}\t${m.getAnnotations()}" }
getWasGeneratedBy   [@javax.persistence.OneToMany(targetEntity=void, cascade=[PERSIST, MERGE], fetch=LAZY, mappedBy=, orphanRemoval=false)]

[delocalizer]

I tracked down the cause to InstanceGenerator#inheritAnnotations use of setAnnotation() inside iteration over the original annotations; it should be addAnnotation()