Middleware clean-up error introduced

[mpdrsn]

First, I really appreciate your work on this! That said, I'm very new to JS and know very little about securing logins, but on your last push, when line 20 was added to middleware.js, postponedRSAAs = [] attempts to reallocate a constant array...and fails when compiled. Although slightly slower, I think that this can be avoided with postponedRSAAs.length = 0

[kmmbvnr]

Yeah, thanks for noticing!