Assertions to test if objects are extensible. #479
Merged
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Thin assertions to test if objects are extensible, sealed, or frozen with
Object.isExtensible()
,Object.isSealed()
, andObject.isFrozen()
. Closes #478.(I did my best to adhere to the already-established code and test style, but if there's something I didn't get quite right or something I could make better, let me know.)