How to decrement a custom field

I would like to decrement the value in a custom field via post function.  I have found the ability to increment by 1 unit (by addon I believe), but not decrement.  

I have tried this using a groovy script post function but believe this is not correct:

 

issue.get(“customField_10426”) = issue.get(“customField_10426”) - 1

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this is using jira misc workflow utils?

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it's helpful to use that tag, otherwise you will get answers for groovy... JMWU tacks on some extra methods that aren't in the API.

Converting Jamie's comment to an answer:

it's helpful to use that tag, otherwise you will get answers for groovy... JMWU tacks on some extra methods that aren't in the API.

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