type-0.90.0 superblock and "md-1" superblocks

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Hello,

I wonder what is the "type-0.90.0" superblock and "md-1" superblocks
of md and what is the differnce between them? Is it merely
some version of kernel md driver ?
In case it is so - is there a way to know which is
the version of the md superblocks which is in use in my kernel ?

I see that in drivers/md/md.c
there is an array of super_type with 2 elements,
the name	of the first is  "0.90.0",and the name of the second
is "md-1".

when running :
mdadm --detail /dev/md0
I see:
/dev/md0:
       Version : 00.90.01
			..
			
is this "Version" field is the superblock type ?


Regards,
MR
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