Identifiers in Lua can be any string of letters, digits, and underscores, not beginning with a digit, of any length. For example:
You should avoid using identifiers starting with an underscore followed by upper-case letters, as these are reserved for Lua variables such as _VERSION.
Lua is case-sensitive, so foo and FOO are different identifiers.
Identifiers cannot be reserved words, these words are reserved:
See Also ...
Lua base functions
(Help topic: lua=identifiers)
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