Compression options `keep_fargs` and `unsafe` were decoupled in v.2.5.0 (commit
5fd1245), so document actual keep_fargs default.
- `drop_console` -- default `false`. Pass `true` to discard calls to
`console.*` functions.
-- `keep_fargs` -- default `false`. Pass `true` to prevent the
+- `keep_fargs` -- default `true`. Prevents the
compressor from discarding unused function arguments. You need this
for code which relies on `Function.length`.
- `void 0` → `undefined` (if there is a variable named "undefined" in
scope; we do it because the variable name will be mangled, typically
reduced to a single character)
-- discards unused function arguments (affects `function.length`)
### Conditional compilation