String.prototype.search has a breaking change from ES5

[Yusuke SUZUKI]

Hi forks,

Seeing ES6 String.prototype.search, there's a breaking change from ES5.

When executing `"gnulluna".search(null)`,

In ES5, RegExp(null) => /null/ is generated, so the result becomes 1.

http://ecma-international.org/ecma-262/5.1/#sec-15.5.4.12

In ES6, we fall down to the 21.1.3.15 step 3 (because null is not
undefined).
And then reaching step 3.a,

  Let searcher be GetMethod(regexp, @@search).

Then TypeError is thrown by GetV's ToObject.

Is it intentional behavior?

Best Regards,
Yusuke Suzuki
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