ImmutableGroup breaks contract between equals and hashCode

Class com.atlassian.crowd.embedded.impl.ImmutableGroup has broken contract between hashCode and equals method - hashCode is derived from a group name however equals compares case insensitive group name. So hashcode for "Group1" and "group1" would be different, however they would be equal. It is problematic especially when groups are put into HashSets or are used as keys in HashMaps. Also com.atlassian.crowd.embedded.api.Group interface specifies that hashCode needs to be case insensitive.