Run middleware before the custom handler if one exists #3530
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Previously if a custom handler was registered to override an existing
handler, the middleware would still run before the existing handler.
custom -> middleware fns -> previous
Now the middleware is not added until after the custom handlers override
any previous handlers. This ensures the middleware always runs first.
middleware fns -> custom -> previous
middleware fns -> custom
middleware fn -> previous
What this PR does / why we need it:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing and/or backwards incompatible change?:
Does this PR require updating code package or user-facing documentation?: