strange yum multiarch behavior

I am in the process of upgrading my desktop from F7 to F8. 'yum update'
fails, so I'm trying it step-by-step.

I use yum-3.2.7 from F8, most of the system is still F7 yet.

Here's what happens when I issue 'yum upgrade glibc':

[kir@dhcp0-6 ~]$ sudo yum upgrade glibc
Setting up Upgrade Process
Resolving Dependencies
--> Running transaction check
---> Package glibc.x86_64 0:2.7-2 set to be updated
--> Processing Dependency: glibc-common = 2.7-2 for package: glibc
--> Processing Dependency: glibc = 2.6-4 for package: glibc-devel
--> Processing Dependency: glibc = 2.6-4 for package: glibc-headers
--> Processing Dependency: glibc = 2.6-4 for package: glibc-devel
--> Processing Dependency: glibc = 2.6-4 for package: glibc-devel
---> Package glibc.i686 0:2.7-2 set to be updated
--> Running transaction check
--> Processing Dependency: glibc-headers = 2.6-4 for package: glibc-devel
---> Package glibc-devel.x86_64 0:2.7-2 set to be updated
---> Package glibc-common.x86_64 0:2.7-2 set to be updated
---> Package glibc-headers.x86_64 0:2.7-2 set to be updated
--> Running transaction check
--> Finished Dependency Resolution

Dependencies Resolved


=============================================================================
Updating:
 glibc                   x86_64     2.7-2            fedora            4.8 M
 glibc                   i686       2.7-2            fedora            5.4 M
Updating for dependencies:
 glibc-common            x86_64     2.7-2            fedora             21 M
 glibc-devel             x86_64     2.7-2            fedora            2.4 M
 glibc-headers           x86_64     2.7-2            fedora            599 k

Transaction Summary
=============================================================================
Install      0 Package(s)
Update       5 Package(s)
Remove       0 Package(s)

Total download size: 34 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
ERROR with rpm_check_debug vs depsolve:
Package glibc-devel needs glibc = 2.6-4, this is not available.
Package glibc-devel needs glibc = 2.6-4, this is not available.
Package glibc-devel needs glibc-headers = 2.6-4, this is not available.
Package glibc-devel needs glibc-headers = 2.6-4, this is not available.
Complete!


See -- the problem is there are two arches for glibc-devel installed,
and somehow yum can't understand that both needs to be upgraded. If I
specify upgrade of glibc-devel explicitly, it works fine:

[kir@dhcp0-6 ~]$ sudo yum upgrade glibc glibc-common glibc-devel
glibc-headers
Setting up Upgrade Process
Resolving Dependencies
--> Running transaction check
---> Package glibc.i686 0:2.7-2 set to be updated
---> Package glibc-devel.x86_64 0:2.7-2 set to be updated
---> Package glibc.x86_64 0:2.7-2 set to be updated
---> Package glibc-devel.i386 0:2.7-2 set to be updated
---> Package glibc-headers.x86_64 0:2.7-2 set to be updated
---> Package glibc-common.x86_64 0:2.7-2 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Updating:
 glibc                   i686       2.7-2            fedora            5.4 M
 glibc                   x86_64     2.7-2            fedora            4.8 M
 glibc-common            x86_64     2.7-2            fedora             21 M
 glibc-devel             x86_64     2.7-2            fedora            2.4 M
 glibc-devel             i386       2.7-2            fedora            2.0 M
 glibc-headers           x86_64     2.7-2            fedora            599 k

Transaction Summary
=============================================================================
Install      0 Package(s)
Update       6 Package(s)
Remove       0 Package(s)

Total download size: 36 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Updating  : glibc-common                 ####################### [ 1/12]
  Updating  : glibc                        ####################### [ 2/12]
  Updating  : glibc                        ####################### [ 3/12]
  Updating  : glibc-headers                ####################### [ 4/12]
  Updating  : glibc-devel                  ####################### [ 5/12]
  Updating  : glibc-devel                  ####################### [ 6/12]
  Cleanup   : glibc                        ####################### [ 7/12]
  Cleanup   : glibc-devel                  ####################### [ 8/12]
  Cleanup   : glibc                        ####################### [ 9/12]
  Cleanup   : glibc-devel                  ####################### [10/12]
  Cleanup   : glibc-headers                ####################### [11/12]
  Cleanup   : glibc-common                 ####################### [12/12]

Updated: glibc.i686 0:2.7-2 glibc.x86_64 0:2.7-2 glibc-common.x86_64
0:2.7-2 glibc-devel.x86_64 0:2.7-2 glibc-devel.i386 0:2.7-2
glibc-headers.x86_64 0:2.7-2
Complete!
[kir@dhcp0-6 ~]$