Disable thread safe Rails in production.
Disable thread safe Rails in production.

I have several reasons for this:
- Thread safety requires us to always preload all non-autoloaded libraries,
  since otherwise race conditions might arise. This makes running even one
  isolated spec slow.
- Rails may be thread-safe, but we do not test our own code for thread-
  safety at all. We have a couple of bugs that only seem to occur in
  production mode, and are hard to reproduce. I'd like to eliminate
  threading as a potential cause.

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