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Add strict types for + and member expressions (#171)

* Strict types for +, resolves #160

* Strict types for object/array access, resolves #152

* Missed typechecking on property assignment

* Add a couple more tests to patch up missed coverage

* Fix bug, null is not an object in rttc

* Use slightly more realistic mockClosure

* Refactor rttc tests

* Property access of null is now a type error instead of a get property error

* Modify typeOf so that null/array look nice in error messages

* Refactor rttc's isObject/isArray

* Make evalWithBuiltins use default parameters

* Make TypeError a RuntimeSourceError, make use of handleRuntimeError's
never type

* Add tests for function redeclaration

404 of 443 branches covered (91.2%)

Branch coverage included in aggregate %.

41 of 41 new or added lines in 3 files covered. (100.0%)

1228 of 1347 relevant lines covered (91.17%)

12083.52 hits per line