respec.org/xref suggests ambiguous linking text for overloaded functions

[jyasskin]

https://respec.org/xref/?term=postMessage%28%29&for=Window lists two results with the linking text {{Window/postMessage()}} for both. When I use that text, Respec complains that it's ambiguous between the two results. I don't see a way to pick a default for a whole spec, and without that, respec.org/xref should suggest {{Window/postMessage(message, targetOrigin, transfer)}} and {{Window/postMessage(message, options)}} instead.