* PR [#593](https://github.com/tiangolo/fastapi/pull/593).
* Improve handling of custom classes for `Request`s and `APIRoute`s.
    * This helps to more easily solve use cases like:
        * Reading a body before and/or after a request (equivalent to a middleware).
        * Run middleware-like code only for a subset of *path operations*.

// validation still applies. if puregoEnabled { return errors.New("FIPS 140-3 mode is incompatible with the purego build tag") } // ASAN disapproves of reading swaths of global memory in fips140/check. // One option would be to expose runtime.asanunpoison through // crypto/internal/fips140deps and then call it to unpoison the range // before reading it, but it is unclear whether that would then cause // false negatives. For now, FIPS+ASAN doesn't need to work. if asanEnabled { return errors.New("FIPS...