Each operand must derive from {@link LuaNumber}or derive from {@link LuaString} and be convertible to a number @param rhs The right-hand-side value to perform the subtract with @return value of {@code (this - rhs)} if both are numeric, or {@link LuaValue} if metatag processing occurs @throws LuaError if either operand is not a number or string convertible to number, and neither has the {@link SUB} metatag defined @see #arithmt(LuaValue,LuaValue)
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