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https://mstdn.maud.io/@omasanoriJohn Resig - ECMAScript 5 Strict Mode, JSON, and More https://johnresig.com/blog/ecmascript-5-strict-mode-json-and-more/
"Note the syntax that’s used to enable strict mode (I love this!). It’s simply a string in a single statement that happens to contain the contents “use strict”. No new syntax is introduced in order to enable strict mode. This is huge. This means that you can turn strict mode on in your scripts – today – and it’ll have, at worst, no side effect in old browsers."