Why is the application a code ref rather than an object with a ->call method?
Requiring an object in addition to a code ref would make EVERY backend’s code a few lines more tedious, while requiring an object instead of a code ref would make application developers write another class and instanciate an object. In other words, yes an object with a call method could work, but again PSGI was designed to be as simple as possible, and making a code reference out of class/object is no brainer but the other way round always requires a few lines of code and possibly a new file.
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