* fix: invoke the window open handler for _blank links * feat: add disposition to setWindowOpenHandler details * fix: pass postData to new-window event * postData can be heterogeneous * fix type of postBody * fix type of UploadFile and UploadRawData to be discriminated unions * exclude the empty string from additionalFeatures * add a test * add postBody and referrer to setWindowOpenHandler args * appease typescript * Update api-browser-window-spec.ts * update snapshots  | 
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