ssh-keygen overrwrites the .pub portion

# ssh-keygen overwrites the .pub portion without asking
# i guess this is fine, but it surprised me

[root@fedora ~]# /usr/bin/ssh-keygen -t rsa -f /root/.ssh/id_rsa -N ''
Generating public/private rsa key pair.
/root/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Your identification has been saved in /root/.ssh/id_rsa
Your public key has been saved in /root/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:dSY5/HGUZ7TKKRbB2dm8cYdE+GtgtQA1uhHOQj0ITGs root@fedora
The key's randomart image is:
+---[RSA 3072]----+
|     oo..o++=+B+.|
|      .o.+o*+=++*|
|      E . @o++.==|
|     .   o O=o=. |
|        S .+.= . |
|          . . o  |
|             .   |
|                 |
|                 |
+----[SHA256]-----+
[root@fedora ~]# rm .ssh/id_rsa                                         rm: remove regular file '.ssh/id_rsa'? y
[root@fedora ~]# file .ssh/id_rsa.pub
.ssh/id_rsa.pub: OpenSSH RSA public key
[root@fedora ~]# /usr/bin/ssh-keygen -t rsa -f /root/.ssh/id_rsa -N ''
Generating public/private rsa key pair.
Your identification has been saved in /root/.ssh/id_rsa
Your public key has been saved in /root/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:+iWJ6phFAD8dc0MSZ4mWo62vnI/PmxUCnHOplPuZtZs root@fedora
The key's randomart image is:
+---[RSA 3072]----+
|.   ==*.         |
| + +=O..         |
|  @++.           |
| ..O.            |
|  o.o o S        |
|  .o = = .       |
|   .= = o .      |
| . B.+ + o       |
|  B=O.E .        |
+----[SHA256]-----+
[root@fedora ~]#