Growing a RAID-0 "internally"?

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Hi.  I have a RAID-0 striped across two partitions; let's call them
/dev/sda2 and /dev/sdb2 (equal size).  These partitions do not stretch
to the end of the respective drives; that is, there is also a
/dev/sda3 and /dev/sdb3 (also equal size).

I want to delete partitions sda3 and sdb3, resize sda2 and sdb2 to
consume the additional space, and then grow my RAID-0 array to use it.

I know how to perform every step (e.g., modifying partition tables,
resizing the file system) except for one:  How do I use mdadm to
change the size of the drives inside the RAID-0 array?  Or is this not
supported?

Thank you.

 - Pat
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