Updates:
Status: WorkingAsIntended
Comment #2 on issue 3671 by [email protected]: No short-circuiting done
when calling substr/substring when the same string value would be returned.
https://code.google.com/p/v8/issues/detail?id=3671
We do not create new strings if the result is trivial. The issue is that
the point where we find out that the result is trivial is pretty late down
the line, after calling into String.prototype.substr, which calls a code
stub.
A lot of the overhead cannot be avoided though: as per spec, we need to
coerce arguments. Some inlining may help, but I don't think this corner
case justifies inlining a big piece of code every time.
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