Cmd windows 10 allow variables with spaces at the right

[carlos]

Hello. This is new for me.
On cmd.exe of windows 10 the variable names allow spaces:

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set var=a
set var =b
set var  =c

echo %var%
echo %var %
echo %var  %

it output:

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a
b
c

[Squashman]

It's not new. It has been this way for a while. I can't test on XP anymore but I am pretty sure it did it like that on XP as well. It certainly does it on Windows 7. I see people do that on StackOverFlow all the time. It is probably the 2nd biggest problem that newbies have with batch files next to delayed expansion.

[carlos]

Yes, I confirm it, is the same on windows xp. But today I write some code like that. I forget that feature.

[Squashman]

Yes, I confirm it, is the same on windows xp. But today I write some code like that. I forget that feature.

But the even confusing part is you can do this:

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set /a numb = 1 +1
echo %numb%