[Bug 20562] New: Objects supporting indexed properties

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20562

            Bug ID: 20562
           Summary: Objects supporting indexed properties
    Classification: Unclassified
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: WebIDL
          Assignee: cam@mcc.id.au
          Reporter: w3c@marcosc.com
        QA Contact: public-webapps-bugzilla@w3.org
                CC: mike@w3.org, public-script-coord@w3.org

At: http://dev.w3.org/2006/webapi/WebIDL/#es-sequence

The spec says "Let length be one greater than V’s maximum indexed property
index, if V is a platform object that supports indexed properties or the result
of calling [[Get]] on V with property name “length” otherwise"

Is there any object that is a platform object that supports indexed properties
but does not have a length property? Is there a use case for not mandating that
such objects have a length property?

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