compress `arguments[index]` (#2967)

- always replace with existing parameter
- only introduce new parameter if `keep_fargs` is disabled

1 files changed, 3 insertions, 0 deletions

diff --git a/README.md b/README.md
index e754e0bc..47fabea1 100644
--- a/README.md
+++ b/README.md
@@ -598,6 +598,9 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 
 ## Compress options
 
+- `arguments` (default: `true`) -- replace `arguments[index]` with function
+  parameter name whenever possible.
+
 - `booleans` (default: `true`) -- various optimizations for boolean context,
   for example `!!a ? b : c → a ? b : c`