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https://issues.apache.org/jira/browse/WOOKIE-151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972000#action_12972000
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Scott Wilson commented on WOOKIE-151:
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The advice I got on the W3C lists is to use array rather than dot notation to
be on the safe side, e.g. widget.preferences[12345]=blah
> Numeric keys for preferences result in Parse Error in Safari
> ------------------------------------------------------------
>
> Key: WOOKIE-151
> URL: https://issues.apache.org/jira/browse/WOOKIE-151
> Project: Wookie
> Issue Type: Bug
> Environment: Safari 5 Mac OS X
> Reporter: Scott Wilson
>
> If you create a widget that uses numeric keys for preference values, this can
> cause a Parse Error deeper in Wookie (most likely, in DWR) even if the values
> are cast to a String.
> To replicate, add this line to any widget:
> widget.preferences.setItem("12345","67890");
> Also:
> widget.preferences.setItem("12345a","67890");
> ...will fail, but not:
> widget.preferences.setItem("a12345","67890");
> I suspect this is something either in the wrapper.js or DWR engine.js.
> Unfortunately the debug tools in Safari aren't sufficient to trace it
> properly.
> As a workaround - just don't use numbers for preference keys!
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