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As a result of #1214 (which was required to fix memory leak issues related to bun and TSS), we introduced an implicit behavior of modifying returned
response.headers.When combined with the default error handler, we were returning a response with a shared JSON header, which, in fact, was causing leaks.
While fix is simply cloning headers for
errorResponseinternal util, this PR makes internals more secure against any possible similar case in the future.