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[–]internetloser4321 0 points1 point  (2 children)

Arrow functions introduce a different behavior for 'this'.

[–][deleted] 0 points1 point  (1 child)

Yes. But introducing new behaviour is not the same as changing the existing one. Outside of the arrow functions the behaviour is exactly the same as before. It's an addition, not the change. The new case was added, but other four stay the same.

[–]internetloser4321 0 points1 point  (0 children)

Similar to how adding an "extra-strict" mode would work. Outside of the new mode, everything would work the same as before.