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    Type:Bug Report 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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    Component/s: external task client js
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    None
vars.get(date) returns invalid Date:
const camundaLib = require('camunda-external-task-client-js');
 const vars = new camundaLib.Variables();
 vars.set('date', new Date());
 vars.get('date'); 
Root cause: Serialization Format is wrong, see https://github.com/camunda/camunda-external-task-client-js/issues/18 and https://github.com/camunda/camunda-external-task-client-js/blob/master/lib/__internal/utils.js#L168 for details