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fixes #2468
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- inline single-use function declarations as expressions when permissible
- depend on `reduce_vars`
- enabled by default
- disable for speed critical code
fixes #2464
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fixes #2449
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fixes #2450
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fixes #2442
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fixes #2440
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- defer declaration removal in `collapse_vars`
- account for `AST_SymbolFunarg` in deduplication
- private accounting for `collapse_vars`
- avoid issues with identity reference due to deep cloning
fixes #2437
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fixes #2428
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fixes #2423
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fixes #2425
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- only replace same-scope usages
- augment `test/ufuzz.js` to test for `this`
fixes #2420
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- trim array items only if `side_effects`
- extend to non-identifier properties
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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 #2324
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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 #2272
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fixes #2254
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- include dead code when `keep_quoted`
- unify `keep_quoted` & `reserved`
- make `test/run-tests.js` consistent with `minify()`
fixes #2256
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fixes #2242
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fixes #2234
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