Tidy up typeof and friends #630

Job	Run time
Performance (hand_written)	3m 43s
basic	3m 42s
Performance (derived)	3m 44s
rrules	3m 42s
integration_testing/misc	3m 42s
integration_testing/diff_tests	3m 41s
integration_testing/distributions	3m 45s
integration_testing/gp	3m 42s
integration_testing/special_functions	1m 25s
integration_testing/array	3m 43s
integration_testing/turing	3m 43s
	38m 32s

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