Re: Manual §2.4 "(even if it is valid)"?

[nobody <nobody+lua-list@...>]

On 2017-10-06 03:46, ? ? wrote:
> 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?

Valid for the operation (here: addition), as in "a number (or a string
coercible to a number)".

The intention is to express that Lua always looks for a metamethod on
the left operand first, failing that on the second (and failing that
throws an error), no matter the types of the values.

-- nobody