[pypy-issue] [issue866] [PATCH] join is slow about 2x slower than Python

[Fijal]

Fijal <fijall at gmail.com> added the comment:

I'm a bit unhappy about isinstance(w_x, W_StringObject) fastpath. Maybe str_w 
should not be a multimethod in the first place then if it's slow? Or maybe 
multimethods should be removed alltogether if they don't work quite that well? It 
should be a simple call in this particular case no?

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