Strings containing escapes get incorrectly un-escaped when converted to Lua

[CircuitButKerbin]

Issue

Strings containing escaped characters get incorrectly un-escaped when converted into lua

Reproduction

Link to the program on the TSTL Playground
The program is:

let someString = "\x80\x00\x20\x7A\x3F\x3E"
print(someString.length)
let str: string = "";
for (let i = 0; i < someString.length; i++) {
    str += string.format("\\x%02X", string.byte(someString[i]));
}
print(str);

Which should print 6 (length of the string) then \x80\x00\x20\x7A\x3F\x3E (the escaped form of the string), but instead prints 7 \xC2\x80\x00\x20\x7A\x3F\x3E, because the string is being un-escaped incorrectly and is adding a non-breaking space to the beginning of the string.
This can be also be seen with the line let someString = "\x80\x00\x20\x7A\x3F\x3E" being converted to someString = "�\0 z?>"