Zeitwerk operates on files in the autoload paths. Since the
entire "app" directory is autoloaded, all files inside need to
play by Zeitwerk's rules. Zeitwerk expects that a file named
"exceptions.rb" would define a constant named "Exceptions".
The exceptions file doesn't follow Zeitwerk's conventions.
The easiest way to solve this is to move the execptions out of
app/lib and into lib, where `require_relative` doesn't have
Zeitwerk taken into account.
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