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. 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.
On Tue, Aug 5, 2014 at 7:56 AM, Mathias Bynens <[email protected]> wrote: > > On 5 Aug 2014, at 16:20, Allen Wirfs-Brock <[email protected]> wrote: > > > We're only talking about Annex B, non-strict. Right? > > All engines are going to implement this anyway, so why make it Annex B > only? I wouldn’t restrict it to non-strict mode either, as this decision > seems to be purely based on the Firefox/SpiderMonkey bug that was discussed > earlier. > > > It would be great is somebody wanted to proposal the actual annex B > language that is need to correctly describe the web reality semantics. > > In section 11.8.3 (Numeric Literals), the definition for > `DecimalIntegerLiteral` should somehow be tweaked to match that of > `DecimalDigits`, with the exception that if the first digit is `0` and all > other digits are octal digits (0-7) it must be treated as a legacy octal > literal. > > > Regarding, leading 0 constants in strict mode. The long term plan is to > eventually make them legal decimal constants. The only reason not to do > that now is because it might screw up people who are migrating non-strict > web reality code containing octal constants into strict mode. > > Firefox is the only browser that throws on `(function() { 'use strict'; > return 08; }())` and the only reason it does that is because of a bug (see > my earlier email). In general, strict mode does not matter here. > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > -- Cheers, --MarkM
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