Feature: Reuse of expressions (ie. long strings)

[moshest]

Consider the following function:

function foo() {
  return {
    a: "long long string", 
    b: "long long string"
  };
}

Uglify minify it to:

function foo(){return{a:"long long string",b:"long long string"}}

But a better compression will be:

function foo(){var r="long long string";return{a:r,b:r}}

There is a reason this feature is not supported?

[kzc]

This feature has been requested a few times over the years but interning strings does not generally produce better gzip results after minification for real life code.

[alexlamsl]

Closing as duplicate of many similar issues, e.g. #75