# Strange behavior with deepcopy

**URL:** <https://discourse.julialang.org/t/strange-behavior-with-deepcopy/23342>\
**Category:** Optimization (Mathematical)\
**Tags:** jump\
**Created:** [April 20, 2019, 11:53am UTC](https://discourse.julialang.org/t/strange-behavior-with-deepcopy/23342 "2019-04-20T11:53:15Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Thuener](https://avatars.discourse-cdn.com/v4/letter/t/7ba0ec/32.png) [@Thuener](https://discourse.julialang.org/u/Thuener)\
**Post date:** [May 8, 2019, 10:15am UTC](https://discourse.julialang.org/t/strange-behavior-with-deepcopy/23342/7 "2019-05-08T10:15:45Z")

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Just to finish this topic.  
There are many people that use deepcopy with JuMP models and don’t know about this issue. Just two suggestions, I think this should be clear in JuMP documentation and using deepcopy in JuMP model should return an error.

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