* make sort-by fail gracefully if mismatched types are compared
* Added a test to check if sorted-by with invalid types exists gracefully
* Linter changes
* removed redundant pattern matching
* Changed the error message
* Added a comma after every argument
* Changed the test to accomodate the new err messages
* Err message for sort-by invalid types now shows the mismatched types
* Lints problems
* Changed unwrap to expect
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