How to dereference Sprint values in issue from API

[Tim]

I'm using ScriptRunner to iterate through the Sprints of an issue.

def sprints = issue.fields['customfield_10004'] as List<Map>

if (sprints == null)
    logger.info("sprints = null")
else
    logger.info("sprints = ${sprints}")

def fieldValues = sprints.each {
    logger.info("it = ${it}")
}

2020-06-15 17:57:27.753 INFO - sprints  = [com.atlassian.greenhopper.service.sprint.Sprint@3887136[completeDate=2020-05-21T02:38:11.056Z,endDate=2020-05-04T15:01:00.000Z,goal=,id=566,name=TSTDEV: Sprint 1,rapidViewId=214,sequence=566,startDate=2020-04-20T15:01:43.272Z,state=CLOSED], com.atlassian.greenhopper.service.sprint.Sprint@1e9b5d3[completeDate=<null>,endDate=2020-06-04T02:40:00.000Z,goal=,id=588,name=TSTDEV: Sprint 2,rapidViewId=214,sequence=588,startDate=2020-05-21T02:40:54.712Z,state=ACTIVE]]
2020-06-15 17:57:27.788 INFO - it = com.atlassian.greenhopper.service.sprint.Sprint@3887136[completeDate=2020-05-21T02:38:11.056Z,endDate=2020-05-04T15:01:00.000Z,goal=,id=566,name=TSTDEV: Sprint 1,rapidViewId=214,sequence=566,startDate=2020-04-20T15:01:43.272Z,state=CLOSED]
2020-06-15 17:57:27.789 INFO - it = com.atlassian.greenhopper.service.sprint.Sprint@1e9b5d3[completeDate=<null>,endDate=2020-06-04T02:40:00.000Z,goal=,id=588,name=TSTDEV: Sprint 2,rapidViewId=214,sequence=588,startDate=2020-05-21T02:40:54.712Z,state=ACTIVE]

 I wouldn't expect the sprint related text in front of the values.  How can I dereference the field values for each sprint?