Mark S. Miller wrote:
Because of compatibility constraints, JS history can generally proceed only in an additive manner, which means a steady degradation of quality along the "simplicity" dimension. An opt-in mode switch is the only way to escape that dynamic.
Not really relevant here, though: 08 and 09 were allowed from the dawn of JS.
Also, another way out than strict mode is to extend the language with better forms and let the bad old ones fade away. This does take time. Simplicity in teaching and actual practice can be addressed by subsets both taught and linted or even checked/compiled. Just sayin' ;-).
Strict mode is the only one we've got, and the only one we're likely to have in the foreseeable future. Strict mode should not accept octal literals. Regarding sloppy mode, it continues to exist only for the sake of legacy compat, so adding more crap to it for better web compat is the right tradeoff -- as long as the crap stays quarantined within sloppy mode.
The question is, are we extending strict mode? See Allen's mail before yours.
We've long agreed (more or less) not to reduce "simplicity" by adding more modes over time, including stricter strict mode.
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