Why do we still have to use quoted string literal to switch on strict in JS? Surely something a little more strongly 'typed' could be used here, like calling a built in function, say, Object.UseStrict()or something like that. What is the reason behind having to resort to a string literal?
Why is "use strict" still a string literal?
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Compatibility across all browsers and JS runtime engines.
E.g., http://ejohn.org/blog/ecmascript-5-strict-mode-json-and-more/