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When a privileged exception object is thrown by a function exported via `exportFunction`, it is reported to the console, and a generic unprivileged exception is re-thrown in its place. This is a problem for test harness code which tests for getters throwing exceptions by catching them and then setting a flag. The re-thrown exception is hidden, but the original is still reported, and becomes a red herring for people debugging tests. This patch catches exceptions thrown by getters (and setters, and other proxy hooks previously overlooked), checks if they're readable by the global the privileged object is wrapped for, wraps them if they are not, and then re-throws them. Differential Revision: https://phabricator.services.mozilla.com/D82782
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