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http://heycam.github.io/webidl/#idl-overloading [[ Consider the effective overload set shown in the previous example. ... ]] The example here isn't invalid any more, since numeric types and DOMString are now overloadable since https://github.com/heycam/webidl/commit/cb90cd9f6678d7e565708468f3331dc11dacf249.
Tentative fix in https://github.com/heycam/webidl/pull/389
*** Bug 25630 has been marked as a duplicate of this bug. ***
Fixed in https://github.com/heycam/webidl/commit/d33f7db.