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http://dev.w3.org/2006/webapi/WebIDL/#es-long-long [[ If x < 253 or x > 253, then throw a TypeError. ]] There's some subscripting missing there in the Bugzilla transcription, but the important bit is that the first less-than is missing a negative sign on 2**53. :-)
Oh yep, thanks: http://dev.w3.org/cvsweb/2006/webapi/WebIDL/Overview.xml.diff?r1=1.686;r2=1.687;f=h http://dev.w3.org/cvsweb/2006/webapi/WebIDL/v1.xml.diff?r1=1.128;r2=1.129;f=h