Allow case classes with up to 254 parameters #16501
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Required to avoid linear composition of conditions in the `equals` method. Fixes scala#16500
The original error case scala#16500 showed an example of deeply nested code which blew up TreePickler with a StackOverflow. We now handle this situation and provide better error diagnostics - point to the closes enclosing definition that caused the SO when pickled - suggest to increase the stack size with -Xss
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To achieve this, we need to avoid linear composition of conditions in the
equalsmethod.Fixes #16500