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> The main changes from rc4 to rc5 are:
> 	[... nothing about unicode escape sequences]

I take that as a NAK for unicode escape sequences *sigh*

Could you then at least throw an error for unknown escape
sequences, for example "\o" gives "undefined escape sequence
near \o"?  That way one can later safely add escape sequences
without silent failure of existing scripts, like this:

  Lua-5.1: print(#"\xaa") --> 3
  Lua-5.2: print(#"\xaa") --> 1