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https://issues.apache.org/jira/browse/FLEX-34951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223531#comment-15223531
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Justin Mclean commented on FLEX-34951:
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I think this is actually OK. Flash will perform an implicit conversion when
returning from a function and undefined in this case is converted to 0. i.e.
It's an implicit conversion to a related type rather than to an unrelated type.
See
http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f87.html
> Returning undefined on a non-void function does not cause an error on
> compiling
> -------------------------------------------------------------------------------
>
> Key: FLEX-34951
> URL: https://issues.apache.org/jira/browse/FLEX-34951
> Project: Apache Flex
> Issue Type: Bug
> Affects Versions: Apache Flex 4.14.1
> Environment: Linux 4.2.3 x86_64
> Reporter: Sword Dragon
> Attachments: testcase.mxml
>
>
> For example if a function expects to get int returned but a String is being
> returned the compiler exits with an error but if undefined is being returned
> the compiler accepts this.
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