Unary minus: return negative value {@code (-this)} as defined by lua unary minus operator
@return boolean inverse as {@link LuaBoolean} if boolean or nil, numeric inverse as {@LuaNumber} if numeric, or metatag processing result if {@link UNM} metatag is defined
@throws LuaError if {@code this} is not a table or string, and has no {@link UNM} metatag
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