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http://dev.w3.org/2006/webapi/WebIDL/#idl-unrestricted-double "The unrestricted double type is a floating point numeric type that corresponds to the set of all possible double-precision 32 bit IEEE 754 floating point numbers, finite and non-finite." Presumably that is a copy/paste glitch and should be "64 bit"
Thanks, fixed!
*** Bug 21251 has been marked as a duplicate of this bug. ***