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Sean Farrow wrote:
> if a string is empty, i.e "" can I compare it with nil?

If you like, but the result will always be false (because an empty
string *isn't* nil).

You can compare for equality (or inequality) any two values, regardless
of type.

You can only do an ordered compare (<, <=, etc) on two values of the
same type, subject to metatable tricks: that's pretty much only numbers
or strings, for example. (But not numbers *and* strings; "3" < 3 will
produce a type error).

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