Manual §2.4 "(even if it is valid)"?

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Subject: Manual §2.4 "(even if it is valid)"?
From: ? ? <zrui16@...>
Date: Fri, 6 Oct 2017 01:46:53 +0000

In Manual §2.4 in the description of __add metamethod:

If any operand for an addition is not a number (nor a string coercible to a number), Lua will try to call a metamethod. First, Lua will check the first operand (even if it is valid). ...

What does "(even if it is valid)" mean here?

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