EnsureIsAscii     251 src/v8utils.h    bool EnsureIsAscii(bool abort_if_failed) const;
EnsureIsAscii     252 src/v8utils.h    bool EnsureIsAscii() const { return EnsureIsAscii(true); }
EnsureIsAscii     253 src/v8utils.h    bool IsAscii() const { return EnsureIsAscii(false); }