There's no const in IE, so we are pretty sure we can take the hit of
breaking "Mozilla" (non-IE branches, also WebKit, maybe Opera) code that
uses const.
/be
Brandon Benvie wrote:
The incompatibilities between let/const as implemented in V8 and
Spidermonkey and how they're specified in ES6 are an additional factor:
* Per iteration loop binding (V8 and Spidermonkey don't do this for
let/const).
* TDZ. `x; const x = 10` works in V8 and Spidermonkey currently,
specified to throw ReferenceError in ES6
I think there's other differences.
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