scp (4.3p2) no longer allows a space in the userid.

Prior to upgrading to 4.3p2 (4.2p1 and before) I was able to do the
following:
scp foo "MY USERID"@myputer.net:tmp
With the userid having a space in it. Now when I issue
the command I get an error message "MY USERID: invalid user name".
The machines with a space in the username are WinDoze.
I have searched the ChangeLog and can't find any mention of this.
In addition, I searched the archives and didn't see where someone
else was having this same problem. I compiled openssh on Solaris 9.
I have also noted this same behavior within Cygwin as well.

Was this change intentional?

Chris

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