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fixes #2377
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`{ a: x, b: y }.a` => `[ x, y ][0]`
- `x` cannot be function containing `this`
`[ x, y, z ][1]` => `(x, z, y)`
- only if `z` is side-effect-free
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Suppress scanning beyond assignment to `a.b`
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fixes #2364
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fixes #2364
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- constant expression
- single reference
- same scope
- not across loop body
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fixes #2336
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fixes #2319
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fixes #2313
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Avoid collision with local variable `undefined` under certain corner cases.
fixes #2298
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fixes #2295
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fixes #2288
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fixes #2234
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fixes #2233
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fixes #2231
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fixes #2226
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- remove hardcoded upper limit
- continue based on node count reduction
- emit verbose statistics
fixes #2226
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- guard by `unsafe`
- support `Array`, `Math`, `Number`, `Object` & `String`
fixes #2207
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- only if property value is side-effect-free
- guard by `unsafe`
fixes #2208
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fixes #2203
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fixes #2198
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- eliminate `throw` usages
- suppress extraneous parenthesis
- `new function() {foo.bar()}.baz`
- `for (function() { "foo" in bar; };;);`
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Eliminate exceptional constructs from normal control flow.
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... by teaching `collapse_vars` some new tricks.
fixes #2187
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- minimise disturbance to `compute_char_frequency()`
- remove extraneous quotation marks
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- let parser rejects non-conformant input
- eliminate need for extraneous parenthesis
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fixes #2140
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