Hey,
I think this is a normal behavior. It's up to you to make sure that '\' is allways properly escaped.
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Originally Posted by Lua Reference Manual
Literal strings can be delimited by matching single or double quotes, and can contain the following C-like escape sequences: '\a' (bell), '\b' (backspace), '\f' (form feed), '\n' (newline), '\r' (carriage return), '\t' (horizontal tab), '\v' (vertical tab), '\\' (backslash), '\"' (quotation mark [double quote]), and '\'' (apostrophe [single quote])
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You can also write:
local text = "Blah\\blah"
d(text)
you will get:
Blah\blah
Edit:
On the other hand they are escaping " characters, so you may be right that they should also escape \.