[8.x] Improve the exception thrown when JSON encoding response contents fails #36851
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This improves on the opaque exception of "The Response content must be a string or object implementing __toString(), “boolean” given." that occurs whenever a call to $response->setContent($varThatFailsJsonEncoding) is made. It is difficult to debug the original exception, because to the developer they are not providing a boolean anywhere in their code, they are passing an array or an object to setContent() and expecting it to work; not knowing that Laravel internally tries to json_encode() that value before passing it along to Symfony, which only understands string values as response contents.
Refs: