[issue2630] repr() should not escape non-ASCII characters

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

What if we turn on the backslashreplace trick for some operations only?
For example: sys_displayhook and sys_excepthook.

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nosy: +amaury.forgeotdarc

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