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> You probably do not see that this script is actually embedded at runtime in a block starting at line 1: the start of the block (which actually makes an anonymous function) has active (invisible) code prepended at start of the line, even if line 1 is then only followed by a comment. The script is also followed by an end of block containing some active code (with an implicit return statement just before it, and a function call just after it), but this appending does not increment the line counter.

This is definitely not true: the Lua compiler does not prepend or
append any text to the code it receives. Use my ltokenp token
processor to see the stream of tokens that the compiler receives.