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When our project upgraded to jQuery3.2.1 (from 2.2.4), we found a memory leak about Deferred in jQuery3.x . the promise.then method does not release the handler & handler Closure .
it work well in jQuery2.x and native Promise in chrome .
look at the following case：
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Here's a version with non-minified jQuery: https://plnkr.co/edit/SE4DMFg8g3SGqDdhxCXx
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Deferred: fix memory leak of promise callbacks
Update jQuery to version 3.3.1
Especially fixes for jquery/jquery#3808 and
jquery/jquery#3606 are important.
Full change log can be found here:
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