specification of []int(string) and []byte(string). also clarify other string conversions.
specification of []int(string) and []byte(string).
also clarify other string conversions.

R=rsc, iant, gri, ken2
CC=golang-dev
http://codereview.appspot.com/207103

nightlyone/golang,h8liu/golang,tianon/debian-golang,tianon/debian-golang,dsriram/golang,nightlyone/golang,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,bdwalton/debian-golang,tv42/old-go,nightlyone/golang,apparentlymart/golang,nightlyone/golang,ssrl/go,nightlyone/golang,tv42/old-go,bdwalton/debian-golang,bdwalton/debian-golang,apparentlymart/golang,h8liu/golang,nightlyone/golang,bdwalton/debian-golang,h8liu/golang,tv42/old-go,tianon/debian-golang,h8liu/golang,tianon/debian-golang,apparentlymart/golang,pombredanne/go-deleteme,dsriram/golang,tv42/old-go,pombredanne/go-deleteme,h8liu/golang,ssrl/go,h8liu/golang,dsriram/golang,gnanderson/go,ssrl/go,apparentlymart/golang,gnanderson/go,gnanderson/go,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,bdwalton/debian-golang,dsriram/golang,nightlyone/golang,tianon/debian-golang,pombredanne/go-deleteme,gnanderson/go,tianon/debian-golang,apparentlymart/golang,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,bdwalton/debian-golang,tianon/debian-golang,ssrl/go,ssrl/go,bdwalton/debian-golang,ssrl/go,ssrl/go,bdwalton/debian-golang,tv42/old-go,h8liu/golang,tianon/debian-golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,gnanderson/go,apparentlymart/golang