Re: [w3c/IndexedDB] "If an exception was propagated out from any event handler" is not a thing (#140)

I haven't spec'd window.onerror integration yet (see https://github.com/w3c/IndexedDB/issues/49) -  it's implemented in Firefox but not Chrome. (I hit a performance regression whenever I try, and then get distracted by other shiny things.) Since IDB is exposed in workers there was apparently some trickiness on the spec side too, but that may have been sorted out.

But in Firefox, yes - an error from a request that does not have `preventDefault()` called on the event causes the transaction to abort and propagates to window.onerror, but by the time it hits the global error handler it's too late to "preventDefault()" and stop the transaction from aborting.

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